echoserver.py binds to a different port to avoid interference with X11. Fixes #485.

changelog.rst

@@ -40,6 +40,8 @@ Unreleased
   Python 3 counterpart.
 - An exception starting a child process with the ``gevent.subprocess``
   module no longer leaks file descriptors. Reported in :pr:`374` by 陈小玉.
+- The example ``echoserver.py`` no longer binds to the standard X11
+  TCP port. Reported in :issue:`485` by minusf.
 
 1.1a1 (Jun 29, 2015)
 ====================

examples/echoserver.py

 #!/usr/bin/env python
-"""Simple server that listens on port 6000 and echos back every input to the client.
+"""Simple server that listens on port 16000 and echos back every input to the client.
 
 Connect to it with:
-  telnet localhost 6000
+  telnet localhost 16000
 
 Terminate the connection by terminating telnet (typically Ctrl-] and then 'quit').
 """
@@ -30,8 +30,8 @@ def echo(socket, address):
 
 if __name__ == '__main__':
     # to make the server use SSL, pass certfile and keyfile arguments to the constructor
-    server = StreamServer(('0.0.0.0', 6000), echo)
+    server = StreamServer(('0.0.0.0', 16000), echo)
     # to start the server asynchronously, use its start() method;
     # we use blocking serve_forever() here because we have no other jobs
-    print('Starting echo server on port 6000')
+    print('Starting echo server on port 16000')
     server.serve_forever()

greentest/test__example_echoserver.py

@@ -16,7 +16,7 @@ class Test(util.TestServer):
             else:
                 kwargs = {'bufsize': 1}
             kwargs['mode'] = 'rb'
-            conn = create_connection(('127.0.0.1', 6000))
+            conn = create_connection(('127.0.0.1', 16000))
             conn.settimeout(0.1)
             rfile = conn.makefile(**kwargs)