ErrLookup › fatedier/frp

fatedier/frp

A fast reverse proxy to help you expose a local server behind a NAT or firewall to the internet. · Go · 248 source files

Analyzed at 6c8a8d0a97 on 2026-08-15. 360 documented errors.

Code / Message	Type	Severity	Tags
HTTP ${response.status}	http	error	http, typescript, frpc, admin-api, dashboard
HTTP ${response.status}	http	error	http, typescript, frps, dashboard, authentication
envelope?.msg \|\| `HTTP ${response.status}`	http	error	http, typescript, frps, api-v2, envelope
Invalid API v2 response	exception	error	http, typescript, frps, api-v2, schema-mismatch
envelope.msg	http	error	http, typescript, frps, api-v2, validation
`ErrInvalidArgument` invalid argument	error_code	error	go, frpc, config-management, validation, admin-api
`ErrNotFound` not found	error_code	error	go, frpc, config-management, not-found, admin-api
`ErrConflict` conflict	error_code	error	go, frpc, config-management, conflict, admin-api
`ErrStoreDisabled` store disabled	error_code	error	go, frpc, config-management, feature-disabled, admin-api
loginRespMsg.Error	console	error	go, frpc, login, authentication, network
serverHello.Error	console	error	go, frpc, wire-protocol, v2, handshake
missing v2 crypto negotiation	console	error	go, frpc, wire-protocol, v2, invariant
`ErrHealthCheckType` error health check type	error_code	error	go, frpc, health-check, configuration
VirtualNet-dependent configuration requires a VirtualNet run	validation	error	go, frpc, virtual-net, reload, feature-gates
`ErrNoTunnelSession` no tunnel session	error_code	error	go, frpc, xtcp, visitor, nat-hole
no sources configured	console	error	go, config, aggregator, api-misuse
`ErrAlreadyExists` already exists	error_code	error	go, config, store, conflict, frpc
unit not support	validation	error	go, configuration, bandwidth, parsing
type is required	validation	error	go, configuration, json, decoding, frpc
plugin type is empty	validation	error	config, plugin, json, decode, frpc
visitor plugin type is empty	validation	error	config, visitor, plugin, json, decode, frpc
auth.oidc.clientID is required; auth.oidc.tokenEndpointURL i	validation	error	config, auth, oidc, validation, security
localAddr is required	validation	error	config, plugin, http2https, validation, frpc
localPath is required	validation	error	config, plugin, static-file, validation, frpc
unixPath is required	validation	error	config, plugin, unix-socket, validation, frpc
name should not be empty	validation	error	config, proxy, validation, frpc, naming
subdomain and custom domains should not be both empty	validation	error	config, proxy, http, domain, validation, frpc
subdomain is not supported because this feature is not enabl	validation	error	config, proxy, subdomain, validation, frps, routing
'.' and '*' are not supported in subdomain	validation	error	config, proxy, subdomain, validation, frps, routing
unknown proxy config type	validation	error	go-api, proxy, validation, type-switch, version-mismatch
unknown visitor config type	validation	error	go-api, visitor, validation, type-switch, stcp
name is required	validation	error	config, visitor, validation, frpc, naming
server name is required	validation	error	config, visitor, validation, frpc, stcp
bind port is required	validation	error	config, visitor, validation, frpc, port
file configuration is required when type is 'file'	validation	error	config, value-source, validation, secrets, file
exec configuration is required when type is 'exec'	validation	error	frp, go, config, validation, auth
file path cannot be empty	validation	error	frp, go, config, validation, auth
exec command cannot be empty	validation	error	frp, go, config, validation, exec
exec env name cannot be empty	validation	error	frp, go, config, validation, exec, env
exec env name cannot contain '='	validation	error	frp, go, config, validation, exec, env
send ${op} request to plugin error	exception	error	frp, go, plugin, server, network
destinationIP is required	validation	error	frp, go, visitor, virtual-net, config
ps.Err	exception	error	frp, go, ssh, gateway, proxy-status
no route found	http	error	frp, go, vhost, http, routing, server
router config conflict	exception	error	frp, go, vhost, routing, conflict, server
group auth failed	exception	error	frp, go, group, load-balance, auth, server
group params invalid	exception	error	frp, go, group, load-balance, config, server
group should have same remote port	exception	error	frp, go, group, load-balance, port, server
port already used	exception	error	frp, go, port, server, conflict
port not allowed	exception	error	frp, go, port, policy, server, config
port unavailable	exception	error	frp, go, port, os, bind, server
invalid argument: frpc has no config file path	http	error	frp, frpc, go, config, reload, admin-api
invalid argument: %v	http	error	frp, frpc, go, config, parse, reload
apply config failed: %v	http	error	frp, frpc, go, config, reload, apply
invalid argument: body can't be empty	http	error	frp, frpc, config, admin-api, http
invalid argument: proxy name is required	http	error	frp, frpc, store, proxy, validation
not found: proxy %q	http	error	frp, frpc, store, proxy, not-found
invalid argument: validation error: %v	http	error	frp, frpc, store, proxy, validation
conflict: %v	http	error	frp, frpc, store, proxy, conflict, idempotency
invalid argument: invalid proxy config: type is required	http	error	frp, frpc, store, proxy, validation, json
invalid argument: proxy name in URL must match name in body	http	error	frp, frpc, store, proxy, validation, rest
not found: %v	http	error	frp, frpc, store, proxy, not-found
invalid argument: visitor name is required	http	error	frp, frpc, store, visitor, validation
not found: visitor %q	http	error	frp, frpc, store, visitor, not-found
invalid argument: invalid visitor config: type is required	http	error	frp, frpc, store, visitor, validation, json
invalid argument: visitor name in URL must match name in bod	http	error	frp, frpc, config-store, validation, api
store disabled: store API is disabled	http	error	frp, frpc, config-store, configuration, api
apply config failed: failed to apply config: %v	http	error	frp, frpc, config-store, reload, apply
apply config failed: proxy %q not found in store after mutat	http	error	frp, frpc, config-store, race-condition, internal
apply config failed: visitor %q not found in store after mut	http	error	frp, frpc, config-store, race-condition, internal
invalid proxy config	validation	error	frp, frpc, config-store, validation, proxy
invalid visitor config	validation	error	frp, frpc, config-store, validation, visitor
create control crypto read writer: %w	exception	critical	frp, frpc, crypto, handshake, network
unexpected frame type %d, want %d	exception	critical	frp, frpc, handshake, protocol, network
do http health check, StatusCode is [%d] not 2xx	exception	warning	http, health-check, frpc, monitoring
proxy name is required	validation	error	api, validation, proxy, frpc-admin
invalid proxy type: %s	validation	error	api, validation, proxy-type, frpc-admin
proxy name in URL must match name in body	validation	error	api, validation, update, frpc-admin
exactly one proxy type block is required	http	error	api, validation, proxy-type, frpc-admin
proxy type block %q does not match type %q	http	error	api, validation, proxy-type, frpc-admin
visitor name is required	http	error	api, validation, visitor, frpc-admin
invalid visitor type: %s	http	error	api, validation, visitor, frpc-admin
visitor name in URL must match name in body	http	error	api, validation, update, frpc-admin
exactly one visitor type block is required	http	error	api, validation, visitor, frpc-admin
visitor type block %q does not match type %q	http	error	api, validation, visitor, frpc-admin
create encryption stream error: %w	exception	error	encryption, auth, transport, frpc
failed to load config from aggregator: %w	console	critical	config, startup, frpc, parse-error
login to the server failed: %v. With loginFailExit enabled,	console	critical	login, auth, startup, frpc, network
reload config from sources failed: %w	console	error	config, reload, frpc, parse-error
sudp ResolveUDPAddr error: %v	exception	error	udp, visitor, config, sudp
listen udp port %s error: %v	exception	error	udp, visitor, port-binding, sudp
connect to server error: %v	exception	error	visitor, network, connection, frpc
send newVisitorConnMsg to server error: %v	exception	error	network, visitor, frpc, connection
read newVisitorConnRespMsg error: %v	exception	error	network, timeout, visitor, frpc
start new visitor connection error: %s	exception	error	config, auth, visitor, server-rejection
create encryption stream error: %v	exception	error	encryption, config, visitor, network
open tunnel timeout	exception	error	xtcp, nat, timeout, p2p, udp
dial udp error: %v	exception	error	xtcp, kcp, udp, system-resources
create kcp connection from udp connection error: %v	exception	error	xtcp, kcp, udp, nat
initial client session error: %v	exception	error	xtcp, kcp, multiplexing, version-mismatch
create tls config error: %v	exception	warning	xtcp, quic, tls, dead-code
dial quic error: %v	exception	error	xtcp, quic, nat, udp, timeout
nat_hole_stun_server can not be empty	validation	error	config, nathole, stun, cli
failed to set config source: %w	console	error	config, embedding, frpc, validation
failed to set config source: %w	console	error	config, frpc, validation, startup
failed to create store source: %w	console	error	config, filesystem, store, frpc
failed to load config from sources: %w	exception	error	store, config, upgrade, frpc
failed to resolve auth.tokenSource: %w	exception	critical	auth, token, config, secrets
unsupported auth method: %s	validation	error	auth, config, validation
failed to read OIDC CA certificate file %q: %w	exception	error	auth, oidc, tls, filesystem
failed to parse OIDC CA certificate from file %q	validation	error	auth, oidc, tls, certificate, config
failed to parse OIDC proxy URL %q: %w	validation	error	frp, oidc, proxy, config, url-parsing
failed to create OIDC HTTP client: %w	exception	error	frp, oidc, tls, ca-certificate, http-client
couldn't generate OIDC token for login: %v	exception	error	frp, oidc, authentication, token, oauth2
couldn't acquire OIDC token for login: %v	exception	error	frp, oidc, value-source, kubernetes, secrets
invalid OIDC token in login: %v	exception	error	frp, oidc, jwt, verification, authentication
invalid OIDC token in ping: %v	exception	error	frp, oidc, jwt, heartbeat, verification
received different OIDC subject in login and ping. new subje	exception	error	frp, oidc, subject-mismatch, session, anti-spoofing
token in login doesn't match token from configuration	exception	error	frp, authentication, token, md5, config-mismatch
token in heartbeat doesn't match token from configuration	exception	error	frp, authentication, token, heartbeat, config-mismatch
token in NewWorkConn doesn't match token from configuration	exception	error	frp, authentication, token, work-connection, config-mismatch
invalid configuration file, not found [common] section	validation	error	frp, config, ini, legacy, client
failed to render template for proxy %s: %v	validation	error	frp, config, ini, range-proxy, legacy
failed to parse proxy %s, err: %v	validation	error	frp, config, ini, proxy, validation
failed to parse visitor %s, err: %v	validation	error	frp, config, ini, visitor, stcp
proxy %s role should be 'server' or 'visitor'	validation	error	frp, config, ini, role, validation
local_port or remote_port is empty	validation	error	frp, config, ini, range-proxy, validation
local ports number should be same with remote ports number	validation	error	frp, config, ini, range-proxy, port-mapping
local_port and remote_port is necessary	validation	error	frp, config, ini, range-proxy, defensive-code
local_port new key in section error: %v	validation	warning	frp, config, ini, range-proxy, go-ini
remote_port new key in section error: %v	validation	warning	frp, config, ini, range-proxy, go-ini
invalid heartbeat_timeout, heartbeat_timeout is less than he	validation	error	config, validation, heartbeat, legacy-ini, frpc
invalid protocol	validation	error	config, validation, protocol, legacy-ini, frpc
include: parse directory of %s failed: %v	validation	error	config, filesystem, include, legacy-ini, frpc
include: directory of %s not exist	validation	error	config, filesystem, include, legacy-ini, frpc
parse config error: %v	validation	error	config, validation, legacy-ini, frpc, error-wrapping
getIncludeContents error: %v	validation	error	config, include, template, legacy-ini, frpc
render extra config %s error: %v	validation	error	config, template, include, legacy-ini, frpc
invalid type [%s]	validation	error	config, proxy, validation, legacy-ini, frpc
type shouldn't be empty	validation	error	config, visitor, validation, legacy-ini, frpc
type [%s] error	validation	error	config, visitor, validation, legacy-ini, frpc
toml: line %d, column %d: %s	validation	error	config, toml, parsing, syntax
line %d: field "%s": cannot unmarshal %s into %s	validation	error	config, yaml, json, type-conversion, parsing
field "%s": cannot unmarshal %s into %s	validation	error	config, json, yaml, type-conversion, parsing
proxy name [%s] is duplicated	validation	error	config, proxy, duplicate, validation, includes
visitor name [%s] is duplicated	validation	error	config, visitor, duplicate, validation, includes
load additional config from %s error: %v	validation	error	config, includes, toml, yaml, frpc
load source: %w	validation	error	config, aggregator, error-wrapping, sources, frpc
path is required	validation	error	config, store, validation, api, frpc
failed to load existing data: %w	exception	error	filesystem, permissions, initialization, go, config-store
failed to parse JSON: %w	validation	error	json, config, corruption, parsing, go
failed to decode proxy at index %d: %w	validation	error	json, schema, version-compat, config, decoding, go
proxy name cannot be empty	validation	error	json, config, validation, required-field, go
failed to decode visitor at index %d: %w	validation	error	json, schema, version-compat, config, decoding, visitor, go
visitor name cannot be empty	validation	error	json, config, validation, required-field, visitor, go
failed to marshal JSON: %w	exception	error	json, serialization, custom-types, go
failed to create directory: %w	exception	error	filesystem, permissions, directory, container, go
failed to create temp file: %w	exception	error	filesystem, permissions, read-only, temp-file, go
failed to write temp file: %w	exception	error	filesystem, disk-full, io, go
failed to sync temp file: %w	exception	error	filesystem, io, fsync, storage-health, go
failed to close temp file: %w	exception	error	filesystem, io, storage-health, go
failed to rename temp file: %w	exception	error	filesystem, rename, windows, file-locking, atomic-write, go
failed to persist: %w	exception	error	persistence, rollback, error-chaining, go
%w: %s %q	http	warning	conflict, duplicate, validation, idempotency, go
%s name cannot be empty	validation	warning	validation, caller-error, empty-string, go
proxy name cannot be empty	validation	warning	validation, required-field, caller-error, go
visitor name cannot be empty	validation	warning	validation, required-field, visitor, caller-error, go
first and second range numbers are not in pairs	validation	error	go, frp, config, port-range, validation
range number is invalid, %v	validation	error	go, frp, config, json, port-range, parse-error
range number is invalid	validation	error	go, frp, config, json, port-range, validation
unknown proxy type: %s	validation	error	go, frp, config, json, proxy, decode
unmarshal ProxyConfig error: %v	validation	error	go, frp, config, json, proxy, decode, type-mismatch
unmarshal proxy plugin error: %v	validation	error	go, frp, config, json, plugin, decode
unknown visitor type: %s	validation	error	go, frp, config, json, visitor, decode
unmarshal VisitorConfig error: %v	validation	error	go, frp, config, json, visitor, decode, type-mismatch
unmarshal visitor plugin error: %v	validation	error	go, frp, config, json, visitor, plugin, decode
unknown plugin type: %s	validation	error	go, frp, config, json, plugin, decode
unmarshal ClientPluginOptions error: %v	validation	error	go, frp, config, json, plugin, decode, type-mismatch
unknown visitor plugin type: %s	validation	error	go, frp, config, json, visitor, plugin, decode
unmarshal VisitorPluginOptions error: %v	validation	error	go, frp, config, json, visitor, plugin, decode, type-mismatch
decode proxy at index %d: %w	validation	error	go, frp, config, json, proxy, decode, wrapper
decode visitor at index %d: %w	validation	error	go, frp, config, json, visitor, decode, wrapper
cannot specify both auth.token and auth.tokenSource	validation	error	go, frp, config, auth, validation
invalid auth.tokenSource: %v	validation	error	go, frp, config, auth, validation, token-source
VirtualNet feature is not enabled; enable it by setting the	validation	error	frp, config, feature-gate, virtual-network, go
invalid auth method, optional values are %v	validation	error	frp, config, auth, validation, go
invalid auth additional scopes, optional values are %v	validation	error	frp, config, auth, scopes, go
cannot specify both auth.oidc.tokenSource and any other fiel	validation	error	frp, config, oidc, auth, mutual-exclusion, go
invalid auth.oidc.tokenSource: %v	validation	error	frp, config, oidc, token-source, go
invalid transport.heartbeatTimeout, heartbeat timeout should	validation	error	frp, config, transport, heartbeat, go
%s is invalid when transport.tls.enable is false	validation	warning	frp, config, tls, transport, go
invalid transport.protocol, optional values are %v	validation	error	frp, config, transport, protocol, go
invalid transport.wireProtocol, optional values are %v	validation	error	frp, config, transport, wire-protocol, go
include: parse directory of %s failed: %v	validation	error	frp, config, includes, filesystem, go
include: directory of %s not exist	validation	error	frp, config, includes, filesystem, deployment, go
proxy %s: %v	validation	error	frp, config, proxy, validation, go
visitor %s: %v	validation	error	frp, config, visitor, stcp, validation, go
tls.certFile must be specified when tls is enabled	validation	error	frp, config, webserver, tls, dashboard, go
tls.keyFile must be specified when tls is enabled	validation	error	frp, config, webserver, tls, go
%s: port number %d must be in the range 0..65535	validation	error	frp, config, port, validation, go
invalid log level, optional values are %v	validation	error	frp, config, logging, go
%s cannot be empty	validation	error	frp, protocol, identifier, run-id, go
%s is too long: length %d exceeds maximum %d	validation	error	frp, protocol, identifier, length-limit, go
%s must be valid UTF-8	validation	error	frp, protocol, identifier, utf-8, encoding, go
%s contains non-printable character	validation	error
not support proxy protocol version: %s	validation	error
bandwidth limit mode should be client or server	validation	error
localPort: %v	validation	error
not support health check type: %s	validation	error
health check path should not be empty	validation	error
plugin %s: %v	validation	error
custom domain [%s] should not belong to subdomain host [%s]	validation	error
not support multiplexer: %s	validation	error
tcpmux with multiplexer httpconnect not supported because th	validation	error
type [http] not supported when vhost http port is not set	validation	error
type [https] not supported when vhost https port is not set	validation	error
annotation key %s is invalid: %s	validation	error
annotations size %d is larger than limit %d	validation	error
invalid auth method, optional values are %v	validation	error
invalid auth additional scopes, optional values are %v	validation	error
invalid transport.maxPoolCount, must be non-negative	validation	error
invalid http plugin ops, optional values are %v	validation	error
unsafe feature %q is not enabled. To enable it, ensure it is	validation	error
protocol should be kcp or quic	validation	error
unsupported value source type: %s (only 'file' and 'exec' ar	validation	error	config, validation, frp, value-source
unsupported value source type: %s	validation	error	config, validation, frp, value-source, unreachable-branch
failed to read file %s: %v	exception	error	filesystem, config, frp, permissions, docker
failed to execute command %v: %v	exception	error	exec, subprocess, config, frp, shell
truncated zone	validation	error	protocol, binary, udp, frp, corruption
IPv4 zone is forbidden	validation	error	protocol, binary, udp, ipv4, validation
zone is not valid UTF-8	validation	error	protocol, binary, udp, utf-8, validation
received JSON UDP packet after binary codec negotiation	exception	error	protocol, udp, codec, negotiation, version-mismatch, frp
unexpected frame type %d, want %d	exception	error	protocol, framing, udp, frp
message frame payload too short	validation	error	protocol, framing, validation, udp, frp
unexpected message type %d, want %d	exception	error	protocol, udp, message-routing, frp
UDP packet codec %q requires wire protocol v2	validation	error	config, protocol, udp, frp, version-mismatch
unsupported UDP packet codec %q	validation	error	config, validation, udp, frp
unsupported wire protocol %q	validation	error	config, validation, protocol, frp
unexpected frame type %d, want %d	exception	error	protocol, framing, validation, frp
message frame payload too short	validation	error	protocol, framing, validation, frp
unknown v2 message type %d	exception	error	protocol, version-mismatch, frp, message-registry
unexpected message type %s, want %s	exception	error	go, frp, protocol, type-mismatch, serialization
not enough addresses	validation	error	go, frp, nathole, stun, nat, validation
proxy [%s] is repeated	validation	error	go, frp, nathole, xtcp, configuration
xtcp server for [%s] doesn't exist	exception	error	go, frp, nathole, xtcp, configuration, visitor
xtcp connection of [%s] auth failed	exception	error	go, frp, nathole, xtcp, authentication, configuration
classify client nat feature error: %v	exception	error	go, frp, nathole, stun, nat
classify visitor nat feature error: %v	exception	error	go, frp, nathole, stun, nat, visitor
wait response from stun server timeout	exception	error	go, frp, nathole, stun, network, timeout
no external address found	exception	error	go, frp, nathole, stun, configuration, network
get natHoleRespMsg error: %v	exception	error	go, frp, nathole, network, timeout
get natHoleRespMsg error: invalid message type	exception	error	go, frp, nathole, protocol, testing
%s	exception	error	go, frp, nathole, xtcp, configuration
discover error: %v	exception	error	go, frp, nathole, stun, network
discover error: not enough addresses	validation	error	go, frp, nathole, stun, nat
classify nat feature error: %v	exception	error	go, frp, nathole, stun, parsing
resolve local udp addr error: %v	exception	error	go, frp, nathole, ipv6, network
listen local udp addr error: %v	exception	error	go, frp, nathole, network, sockets, resource
natHoleRespMsg get error info: %s	exception	error	nat, p2p, server-rejection, go
natHoleRespMsg get empty candidate addresses	exception	error	nat, p2p, server-response, go
wait detect message error: %v	exception	error	nat, p2p, udp, timeout, go
wait detect message timeout	exception	error	nat, p2p, udp, timeout, go
wait detect message canceled	exception	warning	nat, context-cancellation, p2p, go
gen TLS config error: %v	exception	error	tls, plugin, configuration, go
plugin [%s] is not registered	exception	error	plugin, configuration, registry, go
do http request error code: %d	http	error	plugin, http, server, go
%s	exception	error	plugin, server, authorization, go
send CloseProxy request to plugin errors: %s	exception	warning	plugin, server, lifecycle, go
plugin [%s] is not registered	exception	error	plugin, visitor, configuration, registry, go
invalid destination IP address [%s]	validation	error	plugin, configuration, ip-parsing, visitor, go
unrecognized feature gate: %s	validation	error	feature-flags, configuration, go
cannot set feature gate %v to %v, feature is locked to %v	validation	error	feature-flags, configuration, go
cannot add feature gates after the feature gate is closed	validation	error	feature-flags, lifecycle, go
feature gate %q with different spec already exists: %v	validation	error	feature-flags, configuration, go
no supported crypto algorithm	exception	error	crypto, protocol, handshake, version-mismatch, go
invalid crypto client random length %d, want %d	validation	error	crypto, protocol, validation, handshake, go
unsupported selected message codec: %s	exception	error	handshake, protocol-negotiation, codec, go
unsupported selected UDP packet codec: %s	exception	error	handshake, udp, codec, protocol-negotiation, go
selected UDP packet codec was not advertised by client: %s	validation	error	handshake, udp, capabilities, go
unknown selected crypto algorithm: %s	exception	error	crypto, handshake, protocol-negotiation, go
selected crypto algorithm was not advertised by client: %s	validation	error	crypto, handshake, capabilities, go
invalid crypto server random length %d, want %d	validation	error	crypto, handshake, validation, go
decode ClientHello transcript: %w	exception	error	crypto, json, handshake, go
decode ServerHello transcript: %w	exception	error	crypto, json, handshake, go
generate crypto random: %w	exception	critical	crypto, environment, entropy, go
unsupported frame flags: %d	exception	error	protocol, framing, io, go
frame payload length %d exceeds limit %d	validation	error	protocol, framing, limits, dos-guard, go
unexpected frame type %d, want %d	exception	error	protocol, framing, state-machine, go
unsupported message codec	validation	error	handshake, codec, protocol-negotiation, go
unmarshal http response error: %s	exception	error	sdk, http, json, frpc-admin, go
no proxy status found	exception	warning	sdk, http, proxy-status, go
api status code [%d]	exception	error	sdk, http, auth, frpc-admin, go
internal error	exception	error	ssh, authentication, configuration, file-permissions
unknown public key for remoteAddr %q	exception	warning	ssh, authentication, public-key
parse flags from ssh client error: %v	exception	error	ssh, cli, parsing, user-input
complete client config error: %v	exception	error	ssh, configuration, validation
get addr and extra payload timeout	exception	error	ssh, timeout, protocol, user-input
invalid extra payload	validation	warning	ssh, parsing, dead-code
invalid proxy type: %s, support types: %v	validation	error	ssh, validation, user-input, cli
new proxy configurer error	validation	warning	ssh, dead-code, internal-invariant
generate random id error: %v	exception	error	ssh, random, entropy, environment
open ssh channel error: %v	exception	error	ssh, network, channel, connection-lifecycle
wait proxy status ready timeout	exception	error	ssh, timeout, proxy-lifecycle, port-conflict
ssh tunnel server closed	exception	info	ssh, shutdown, cancellation, lifecycle
failed to parse CA certificate from file %q: no valid PEM ce	validation	error	tls, certificates, pem, configuration
%s	http	error	http, api, error-wrapping, dashboard
invalid limiter burst: %d	validation	warning	rate-limiting, dead-code, platform, bandwidth
channel for kcp listener closed	console	warning	kcp, listener, shutdown, concurrency
listener closed	console	warning	listener, shutdown, concurrency, internal
put conn error: listener is closed	console	warning	listener, concurrency, shutdown, panic-recovery
failed to write proxy protocol header: %v	exception	error	proxy-protocol, encoding, network
non-TLS connection received on a TlsOnly server	exception	error	tls, security, configuration, protocol-detection
udp write closed listener	console	error	udp, network, concurrency, shutdown
channel for udp listener closed	console	info	udp, network, shutdown, lifecycle
connections to tcp vhost must be of method CONNECT	http	error	tcpmux, http, proxy, config
range number is invalid, %v	validation	error	config, validation, ports, parsing
range number is invalid	validation	error	config, validation, ports, range
%v: %s %s %s	http	error	vhost, http, routing, config
listener closed	console	info	vhost, network, lifecycle, shutdown
host header rewrite failed	console	warning	vhost, http, parsing, network
parse route %s error: %v	validation	error	vnet, config, network, validation
no route found for destination %s	console	error	vnet, network, routing, config
no route found for source %s	console	error	vnet, network, routing, config
read message length error: %w	exception	error	vnet, network, protocol, io
message length is 0	exception	error	vnet, protocol, validation, security
message too large: %d > %d	exception	error	vnet, protocol, security, memory
failed to create TUN device '%s': %w	console	error	vnet, tun, linux, permissions
add route to %v error: %v	console	error	vnet, routing, linux, permissions
virtual net is not supported on this platform (%s/%s)	console	error	vnet, platform, tun, config
control manager is closed	exception	error	go, frp, lifecycle, shutdown, concurrency
client_id [%s] for user [%s] is already online	validation	error	go, frp, registry, duplicate, session
client control for run id [%s] is no longer current	exception	warning	go, frp, workconn, generation, stale-session
client control for run id [%s] is not running	exception	warning	go, frp, workconn, lifecycle, state-machine
work connection pool is full, discarding	exception	info	go, frp, workconn, pool, backpressure
invalid pool count %d, must be non-negative	validation	error	go, frp, validation, login, protocol
invalid max pool count %d, must be non-negative	validation	error	go, frp, config, validation, server
invalid effective pool count %d, cannot safely add %d for wo	validation	error	go, frp, validation, overflow, hardening
control is already closed	exception	error	go, frp, workconn, connection-loss, dispatch
client registry unavailable	http	error	go, frp, http-api, v2, dependency-injection
missing %s	http	error	frps, api, routing, validation
proxy type not support	validation	error	frps, proxy, version-mismatch
proxy name [%s] is already in use	validation	error	frps, proxy, naming, duplicate
unknown multiplexer [%s]	validation	error	frps, tcpmux, config
acquire port %d error: %v	exception	error	frps, udp, port-allocation, network
xtcp is not supported in frps	validation	error	frps, xtcp, nathole, p2p
create server listener error, %v	console	critical	frps, startup, network, port
create vhost tcpMuxer error, %v	console	critical	frps, startup, tcpmux, internal
listen on kcp udp address %s error: %v	console	critical	frps, startup, kcp, udp, port
listen on quic udp address %s error: %v	console	critical	frps, startup, quic, udp, tls, port
create ssh gateway error, %v	console	critical	frps, startup, ssh, gateway
create vhost http listener error, %v	console	critical	frps, startup, vhost, http, port
create vhost httpsMuxer error, %v	console	critical	frps, startup, vhost, internal
create nat hole controller error, %v	console	critical	frps, startup, nathole, xtcp
missing v2 crypto negotiation	validation	error	frps, wire-protocol, crypto, handshake, version-mismatch
UDP packet codec %q requires wire protocol v2	validation	error	frpc, config, udp, wire-protocol, validation
unsupported UDP packet codec selection: %s	validation	error	frpc, config, udp, wire-protocol, validation
unsupported wire protocol: %s	validation	error	frp, wire-protocol, handshake, version-skew
invalid run id: %w	validation	error	frp, run-id, validation, login
unexpected error when creating new controller	exception	error	frp, control-connection, opaque-error, diagnostics
ClientHello is not allowed on work connections	validation	error	frp, work-connection, clienthello, protocol-misuse