C++ grpc 1.0.0 client connect to grpc 1.38 server got the erro_code 14 without error_message

[winters kwok]

C++ test cases between grpc 1.0.0 client and grpc 1.38.1 server. 

gRPC client log code pieces:

if (status.ok())

{

  ...

}

else

{

  std::cout << status.error_code() << ": " << status.error_message() << std::endl;

}

The logs show as follow: 

"14:"

Nothing else.

The test run a couple of hours and got more than 10 erro_code "14:", but did not get any error_message.

How to figure out what is the issue? any suggestion? Thank you very much!

[veb...@google.com]

14 means UNAVAILABLE indicating that the backend isn't available. If you can get extra logging & tracing by https://github.com/grpc/grpc/blob/master/TROUBLESHOOTING.md, it would be helpful for you to understand what happened.

And gRPC C++ 1.0 is really old so I recommend to upgrade to the latest.