Do not stop to listen on tcp listeners on temporary errors

pkg/server/server_entrypoint_tcp.go

@@ -135,6 +135,10 @@ func (e *TCPEntryPoint) startTCP(ctx context.Context) {
 		conn, err := e.listener.Accept()
 		if err != nil {
 			logger.Error(err)
+			if netErr, ok := err.(net.Error); ok && netErr.Temporary() {
+				continue
+			}
+
 			return
 		}
 

pkg/tls/certificate.go

@@ -80,7 +80,8 @@ func (f FileOrContent) IsPath() bool {
 
 func (f FileOrContent) Read() ([]byte, error) {
 	var content []byte
-	if _, err := os.Stat(f.String()); err == nil {
+	if f.IsPath() {
+		var err error
 		content, err = ioutil.ReadFile(f.String())
 		if err != nil {
 			return nil, err