Let's make it work and improve the error messages so we can see the reason for the failure without using tcpdump..
Server log:
2019-01-23 23:58:26,107 new_websocket_client() calling <function new_websocket_client at 0x7f479687a398>, request=<websockify.websocket.WebSocket object at 0x7f47a07269d0> (<class 'websockify.websocket.WebSocket'>) 2019-01-23 23:58:26,108 new_websocket_client(<xpra.server.websocket.WSRequestHandler instance at 0x7f47969761b8>) socket=<socket._socketobject object at 0x7f47a08a64b0> 2019-01-23 23:58:26,201 waiting for data: 2019-01-23 23:58:26,201 waiting for data: 2019-01-23 23:58:26,202 waiting for data: 2019-01-23 23:58:26,202 waiting for data: 2019-01-23 23:58:26,202 waiting for data: 2019-01-23 23:58:26,202 waiting for data: 2019-01-23 23:58:26,202 waiting for data: 2019-01-23 23:58:26,202 waiting for data: 2019-01-23 23:58:26,206 waiting for data: 2019-01-23 23:58:26,206 Warning: websocket connection already closed: 2019-01-23 23:58:26,206 1000: Locally initiated close 2019-01-23 23:58:26,207 error closing <websockify.websocket.WebSocket object at 0x7f47a07269d0> Traceback (most recent call last): File "/usr/lib64/python2.7/site-packages/xpra/server/websocket.py", line 348, in close request.close() File "/usr/lib/python2.7/site-packages/websockify-0.8.0-py2.7.egg/websockify/websocket.py", line 497, in close self._close() File "/usr/lib/python2.7/site-packages/websockify-0.8.0-py2.7.egg/websockify/websocket.py", line 695, in _close self.socket.close() AttributeError: 'NoneType' object has no attribute 'close'
Client log:
2019-01-23 23:58:26,375 websocket ws://localhost:10000/.close() for socket=<websocket._core.WebSocket object at 0x7f4965f3e310> 2019-01-23 23:58:26,376 websocket ws://localhost:10000/.close() done 2019-01-23 23:58:26,376 Error: failed to receive anything, not an xpra server? 2019-01-23 23:58:26,376 could also be the wrong protocol, username, password or port 2019-01-23 23:58:26,376 or the session was not found 2019-01-23 23:58:26,377 Connection lost
ngrep capture:
T 127.0.0.1:10000 -> 127.0.0.1:47424 [AP] #12 88 2c 03 eb 55 6e 73 75 70 70 6f 72 74 65 64 3a .,..Unsupported: 20 54 65 78 74 20 66 72 61 6d 65 73 20 61 72 65 Text frames are 20 6e 6f 74 20 73 75 70 70 6f 72 74 65 64 not supported #### T 127.0.0.1:47424 -> 127.0.0.1:10000 [AP] #16 88 82 cc 4c 22 6a cf a4 ...L"j..
Alternatively, we could switch to using websockify in client mode instead of websocket-client - which would also reduce the number of dependencies.
Fixed by not using websockify or websocket-client! See #2121
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2120