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Depend on this tutorials grpc basic

I clone https://github.com/grpc/grpc to local,

cd example/python/helloworld start server python greeter_server.py

then start client python greeter_client.py, but get error 

Traceback (most recent call last):
  File "greeter_client.py", line 35, in <module>
  run()
  File "greeter_client.py", line 30, in run
    response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'))
  File "/usr/local/lib/python3.7/site-packages/grpc/_channel.py", line 533, in __call__
    return _end_unary_response_blocking(state, call, False, None)
  File "/usr/local/lib/python3.7/site-packages/grpc/_channel.py", line 467, in _end_unary_response_blocking
    raise _Rendezvous(state, None, None, deadline) grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
      status = StatusCode.UNAVAILABLE
      details = "Socket closed"
      debug_error_string = "{"created":"@1541228979.471085000","description":"Error received from peer","file":"src/core/lib/surface/call.cc","file_line":1017,"grpc_message":"Socket closed","grpc_status":14}"

then I execuse sudo python greeter_client.py, get the correct result.

Why I should add sudo to get the correct result?

wkzq
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  • I use python2 and python3 get the same error – wkzq Nov 03 '18 at 07:17
  • Can you provide more information about your environment? This seems like most likely a machine configuration issue, so it would also be helpful if you could rule out a local configuration problem by checking if a non-gRPC server/client on the same port will work. – Eric G Nov 07 '18 at 18:43
  • I have same issue. unfortunately "sudo" doesn't help; i am running it on ubuntu16.04. I can run this example inside centos 7 docker containers – ankit patel Nov 07 '18 at 22:43
  • I found I set a global http proxy, so I change 'localhost' to '127.0.0.1', it's fine. – wkzq Nov 09 '18 at 03:00
  • I had a similar error, when i was trying to connect to a secure port with an insecured channel, so keep that in mind too. – NickTheDev Feb 23 '21 at 13:51

2 Answers2

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  1. I found I set a global http proxy export http_proxy=http://127.0.0.1:1087, I closed this proxy, then It was find.

  2. update greeter_client.py, change localhost to 127.0.0.1. It's find to me.

wkzq
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Could you try few options and share your feedback:

Option - 1

another port(except 50051) in client and server?

Option-2

Try with 0.0.0.0 in client

Thanks, Dheeraj

Dheeraj Bhadani
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