hyperledger/fabric · error

error loading TLS key (%s)

Error message

error loading TLS key (%s)

What it means

GetServerConfig enabled TLS but os.ReadFile failed on peer.tls.key.file — the TLS private key file path is missing, unreadable, or the file does not exist, so the gRPC server cannot be configured for TLS.

Source

Thrown at core/peer/config.go:399

			}
		}
	}
	return "", errors.Errorf("no non-loopback, IPv4 interface detected")
}

// GetServerConfig returns the gRPC server configuration for the peer
func GetServerConfig() (comm.ServerConfig, error) {
	serverConfig := comm.ServerConfig{
		ConnectionTimeout: viper.GetDuration("peer.connectiontimeout"),
		SecOpts: comm.SecureOptions{
			UseTLS: viper.GetBool("peer.tls.enabled"),
		},
	}
	if serverConfig.SecOpts.UseTLS {
		// get the certs from the file system
		serverKey, err := os.ReadFile(config.GetPath("peer.tls.key.file"))
		if err != nil {
			return serverConfig, fmt.Errorf("error loading TLS key (%s)", err)
		}
		serverCert, err := os.ReadFile(config.GetPath("peer.tls.cert.file"))
		if err != nil {
			return serverConfig, fmt.Errorf("error loading TLS certificate (%s)", err)
		}
		serverConfig.SecOpts.Certificate = serverCert
		serverConfig.SecOpts.Key = serverKey
		serverConfig.SecOpts.RequireClientCert = viper.GetBool("peer.tls.clientAuthRequired")
		if serverConfig.SecOpts.RequireClientCert {
			var clientRoots [][]byte
			for _, file := range viper.GetStringSlice("peer.tls.clientRootCAs.files") {
				clientRoot, err := os.ReadFile(
					config.TranslatePath(filepath.Dir(viper.ConfigFileUsed()), file),
				)
				if err != nil {
					return serverConfig,
						fmt.Errorf("error loading client root CAs (%s)", err)
				}

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Verify peer.tls.key.file exists and is readable by the peer process
2. Fix the path in core.yaml and regenerate certs if missing

When it happens

Trigger: Thrown at core/peer/config.go:399 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• SSL/TLS and certificate errors — how TLS handshakes and certificate validation fail.

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/7df719bfb70fcd63. Report an issue: GitHub.