{"record":{"id":"c88d2c8403730739","repo":"nats-io/nats-server","slug":"processgatewaysubjectunsub-s","errorCode":null,"errorMessage":"processGatewaySubjectUnsub %s","messagePattern":"processGatewaySubjectUnsub (.+?)","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/gateway.go","lineNumber":1936,"sourceCode":"\t\tremove = false\n\t}\n\tif remove {\n\t\tc.gw.outsim.Delete(accName)\n\t}\n\treturn nil\n}\n\n// RS- protocol received from the remote after sending messages\n// on a subject that it has no interest in (but knows about the\n// account). Mark this subject with a \"no interest\" marker to\n// prevent further messages being sent.\n// If in modeInterestOnly or for a queue sub, remove from\n// the sublist if present.\n// <Invoked from outbound connection's readLoop>\nfunc (c *client) processGatewayRUnsub(arg []byte) error {\n\t_, accName, subject, queue, err := c.parseUnsubProto(arg, true, false)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"processGatewaySubjectUnsub %s\", err.Error())\n\t}\n\n\tvar (\n\t\te          *outsie\n\t\tuseSl      bool\n\t\tnewe       bool\n\t\tcallUpdate bool\n\t\tsrv        *Server\n\t\tsub        *subscription\n\t)\n\n\t// Possibly execute this on exit after all locks have been released.\n\t// If callUpdate is true, srv and sub will be not nil.\n\tdefer func() {\n\t\tif callUpdate {\n\t\t\tsrv.updateInterestForAccountOnGateway(accName, sub, -1)\n\t\t}\n\t}()","sourceCodeStart":1918,"sourceCodeEnd":1954,"githubUrl":"https://github.com/nats-io/nats-server/blob/3a66a489d262bf89b71a71c955c94920394532f3/server/gateway.go#L1918-L1954","documentation":"Wraps any error returned by parseUnsubProto when a gateway route-unsub (RUnsub) request cannot be parsed. The gateway readLoop received a subject-unsubscription message from another cluster's gateway and its arguments were malformed (bad account/subject/queue fields), so the message is rejected and the prefixed error propagates back through the gateway protocol handling.","triggerScenarios":"A remote gateway sends a gateway RUnsub protocol message whose arguments fail parseUnsubProto (wrong number of args, invalid subject, malformed queue name), typically due to protocol mismatch between NATS servers of different versions or a corrupted/garbled inter-cluster connection.","commonSituations":"Mixed-version NATS clusters where an older/newer server sends gateway messages in a different format; a non-NATS or buggy client connecting on a gateway port; corrupted TCP stream between clustered servers.","solutions":["Verify all servers in the cluster run a compatible NATS server version (upgrade/downgrade to match)","Check gateway connection peers for non-NATS traffic or protocol corruption (tls misconfig, proxies rewriting bytes)","Capture gateway traffic (s.gateway debug/trace logs) to see the malformed message and identify the sending peer","If a specific peer is faulty, remove/restart that gateway connection"],"exampleFix":"// before\n// mixed cluster: server A v2.9, server B v2.2 talking over gateways\n// after\n// pin all servers to the same NATS server version, e.g. nats-server --cluster nats://... on identical binaries","handlingStrategy":"validation","validationCode":"// Operator-level guard: run all gateway-connected servers on the same NATS version\n// and monitor logs for processGatewaySubjectUnsub errors to catch a misbehaving peer early.\nif err := srv.WaitForShutdown(...); err != nil { /* inspect log for gateway parse errors */ }","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Keep all cluster/gateway servers on identical NATS server versions","Put gateways on trusted, direct network paths (avoid mutating proxies)","Enable gateway debug/trace in staging to catch protocol issues before production","Monitor logs for gateway parse errors and alert on their first occurrence"],"tags":["gateway","protocol","cluster","parse-error"],"backgroundTag":"gateway-protocol-parse-error","analyzedSha":"3a66a489d262bf89b71a71c955c94920394532f3","analyzedAt":"2026-09-02T04:41:54.247Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}