{"record":{"id":"0452869bd62ea324","repo":"nats-io/nats-server","slug":"failed-to-be-ready-for-connections-after-s-s","errorCode":null,"errorMessage":"failed to be ready for connections after %s: %s","messagePattern":"failed to be ready for connections after (.+?): (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/server.go","lineNumber":4040,"sourceCode":"\t\tif d > 25*time.Millisecond {\n\t\t\ttime.Sleep(25 * time.Millisecond)\n\t\t}\n\t}\n\n\tfailed := make([]string, 0, len(chk))\n\tfor name, inf := range chk {\n\t\tif inf.ok && inf.err != nil {\n\t\t\tfailed = append(failed, fmt.Sprintf(\"%s(ok, but %s)\", name, inf.err))\n\t\t}\n\t\tif !inf.ok && inf.err == nil {\n\t\t\tfailed = append(failed, name)\n\t\t}\n\t\tif !inf.ok && inf.err != nil {\n\t\t\tfailed = append(failed, fmt.Sprintf(\"%s(%s)\", name, inf.err))\n\t\t}\n\t}\n\n\treturn fmt.Errorf(\n\t\t\"failed to be ready for connections after %s: %s\",\n\t\td, strings.Join(failed, \", \"),\n\t)\n}\n\n// ReadyForConnections returns `true` if the server is ready to accept clients\n// and, if routing is enabled, route connections. If after the duration\n// `dur` the server is still not ready, returns `false`.\nfunc (s *Server) ReadyForConnections(dur time.Duration) bool {\n\treturn s.readyForConnections(dur) == nil\n}\n\n// Quick utility to function to tell if the server supports headers.\nfunc (s *Server) supportsHeaders() bool {\n\tif s == nil {\n\t\treturn false\n\t}\n\treturn !(s.getOpts().NoHeaderSupport)","sourceCodeStart":4022,"sourceCodeEnd":4058,"githubUrl":"https://github.com/nats-io/nats-server/blob/3a66a489d262bf89b71a71c955c94920394532f3/server/server.go#L4022-L4058","documentation":"ReadyForConnections exceeded its wait deadline d: at least one subsystem in the readiness check set (client/nats/cluster/gateway/leafnode/websocket monitors etc.) did not report ok within the wait loop. The message aggregates each failed check with its error (format name(err)) or '(ok, but err)' for partial success. It means startup/monitoring is degraded — typically a bind failure (port in use, bad address) or an unreachable solicited route/gateway.","triggerScenarios":"Thrown at server/server.go:4040 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Read the per-subsystem list in the error to find which listener failed and why","Free the occupied port or fix the bind address for the failing monitor","Verify network reachability of solicited routes/gateways/leaf remotes and retry startup"],"exampleFix":null,"handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"3a66a489d262bf89b71a71c955c94920394532f3","analyzedAt":"2026-09-02T04:41:54.247Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T15:18:49.778Z"}