hyperledger/fabric · error

error loading TLS certificate (%s)

Error message

error loading TLS certificate (%s)

What it means

Returned by peer GetServerConfig when os.ReadFile fails on peer.tls.cert.file while TLS is enabled. The key file loaded, but the certificate file path is wrong, missing, or unreadable, so the gRPC server config cannot be completed.

Source

Thrown at core/peer/config.go:403

}

// 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)
				}
				clientRoots = append(clientRoots, clientRoot)
			}
			serverConfig.SecOpts.ClientRootCAs = clientRoots
		}

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Verify peer.tls.cert.file path and permissions in core.yaml
2. Regenerate the TLS certificate material if absent

When it happens

Trigger: Thrown at core/peer/config.go:403 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/9dc71dc67f7ace4b. Report an issue: GitHub.