{"record":{"id":"8055e8cb8346b019","repo":"hyperledger/fabric","slug":"config-currently-at-sequence-d-cannot-validate-c","errorCode":null,"errorMessage":"config currently at sequence %d, cannot validate config at sequence %d","messagePattern":"config currently at sequence (.+?), cannot validate config at sequence (.+?)","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"common/configtx/validator.go","lineNumber":172,"sourceCode":"\t\t\tSequence:     vi.sequence + 1,\n\t\t\tChannelGroup: channelGroup,\n\t\t},\n\t\tLastUpdate: configtx,\n\t}, nil\n}\n\n// Validate simulates applying a ConfigEnvelope to become the new config\nfunc (vi *ValidatorImpl) Validate(configEnv *cb.ConfigEnvelope) error {\n\tif configEnv == nil {\n\t\treturn errors.Errorf(\"config envelope is nil\")\n\t}\n\n\tif configEnv.Config == nil {\n\t\treturn errors.Errorf(\"config envelope has nil config\")\n\t}\n\n\tif configEnv.Config.Sequence != vi.sequence+1 {\n\t\treturn errors.Errorf(\"config currently at sequence %d, cannot validate config at sequence %d\", vi.sequence, configEnv.Config.Sequence)\n\t}\n\n\tconfigUpdateEnv, err := protoutil.EnvelopeToConfigUpdate(configEnv.LastUpdate)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tconfigMap, err := vi.authorizeUpdate(configUpdateEnv)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tchannelGroup, err := configMapToConfig(configMap, vi.namespace)\n\tif err != nil {\n\t\treturn errors.Errorf(\"could not turn configMap back to channelGroup: %s\", err)\n\t}\n\n\t// reflect.Equal will not work here, because it considers nil and empty maps as different","sourceCodeStart":154,"sourceCodeEnd":190,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/common/configtx/validator.go#L154-L190","documentation":"This error comes from the configtx validator's Validate method. The validator maintains the current sequence number of a channel config, and every incoming ConfigEnvelope must advance the sequence by exactly one (current+1). If the submitted config's Sequence is anything else, validation is rejected with this message.","triggerScenarios":"Calling Validator.Validate with a ConfigEnvelope whose Config.Sequence != vi.sequence+1 — e.g. resubmitting an already-applied config, skipping a sequence, or replaying an old config update.","commonSituations":"Submitting a stale configtx update generated earlier against an older channel config; concurrent admin updates where one was already committed; tooling that hand-builds config envelopes with a wrong sequence number; ledger rollbacks that desync the validator's sequence.","solutions":["Fetch the current channel config, read its sequence number, and rebuild the update so Config.Sequence == current+1","Use configtxlator/peer channel fetch config to get the latest config and recompute the update from it","Check for concurrent/f duplicate submissions — the update may already have been applied","If a ledger rollback desynced the sequence, restart or re-initialize the validator from the current committed block"],"exampleFix":"// before\nconfigEnv.Config.Sequence = 5 // hard-coded, channel is at 5\n// after\ncurrentSeq := latestConfig.Sequence\nconfigEnv.Config.Sequence = currentSeq + 1","handlingStrategy":"validation","validationCode":"env, _ := fetchLatestConfigEnvelope(channel)\nif configEnv.Config.Sequence != env.Config.Sequence+1 {\n    return fmt.Errorf(\"rebuild update: expected seq %d, got %d\", env.Config.Sequence+1, configEnv.Config.Sequence)\n}","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Always regenerate updates from the freshly fetched channel config, never cache sequence numbers","Fetch config immediately before creating the update to avoid races with other admins","Use configtxlator rather than hand-assembling ConfigEnvelopes"],"tags":["hyperledger-fabric","configtx","sequence-number"],"backgroundTag":"config-sequence-mismatch","analyzedSha":"2736b63f8fd5932511d56fe68b7039d15977f7f6","analyzedAt":"2026-09-04T08:52:36.465Z","contentChangedAt":"2026-09-04T08:52:36.465Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}