google app engine - HTTPError: HTTP Error 502: Proxy Error ( Connection refused ) -

i continuously getting connection proxy error 502 (connection refused) on google app engine while running devserver locally. proxy passed localserver still its refusing connection.

here getting:

httperror() httperror() traceback (most recent call last):   file "/home/arslan/gae/google_appengine/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 1302, in communicate     req.respond()   file "/home/arslan/gae/google_appengine/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 831, in respond     self.server.gateway(self).respond()   file "/home/arslan/gae/google_appengine/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 2115, in respond     response = self.req.server.wsgi_app(self.env, self.start_response)   file "/home/arslan/gae/google_appengine/google/appengine/tools/devappserver2/wsgi_server.py", line 250, in __call__     return app(environ, start_response)   file "/home/arslan/gae/google_appengine/google/appengine/tools/devappserver2/request_rewriter.py", line 311, in _rewriter_middleware     response_body = iter(application(environ, wrapped_start_response))   file "/home/arslan/gae/google_appengine/google/appengine/tools/devappserver2/python/request_handler.py", line 89, in __call__     self._flush_logs(response.get('logs', []))   file "/home/arslan/gae/google_appengine/google/appengine/tools/devappserver2/python/request_handler.py", line 225, in _flush_logs     apiproxy_stub_map.makesynccall('logservice', 'flush', request, response)   file "/home/arslan/gae/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 94, in makesynccall     return stubmap.makesynccall(service, call, request, response)   file "/home/arslan/gae/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 328, in makesynccall     rpc.checksuccess()   file "/home/arslan/gae/google_appengine/google/appengine/api/apiproxy_rpc.py", line 156, in _waitimpl     self.request, self.response)   file "/home/arslan/gae/google_appengine/google/appengine/ext/remote_api/remote_api_stub.py", line 200, in makesynccall     self._makerealsynccall(service, call, request, response)   file "/home/arslan/gae/google_appengine/google/appengine/ext/remote_api/remote_api_stub.py", line 226, in _makerealsynccall     encoded_response = self._server.send(self._path, encoded_request)   file "/home/arslan/gae/google_appengine/google/appengine/tools/appengine_rpc.py", line 393, in send     f = self.opener.open(req)   file "/usr/lib/python2.7/urllib2.py", line 406, in open     response = meth(req, response)   file "/usr/lib/python2.7/urllib2.py", line 519, in http_response     'http', request, response, code, msg, hdrs)   file "/usr/lib/python2.7/urllib2.py", line 444, in error     return self._call_chain(*args)   file "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain     result = func(*args)   file "/usr/lib/python2.7/urllib2.py", line 527, in http_error_default     raise httperror(req.get_full_url(), code, msg, hdrs, fp) httperror: http error 502: proxy error ( connection refused ) traceback (most recent call last):   file "/home/arslan/gae/google_appengine/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 1302, in communicate     req.respond()   file "/home/arslan/gae/google_appengine/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 831, in respond     self.server.gateway(self).respond()   file "/home/arslan/gae/google_appengine/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 2115, in respond     response = self.req.server.wsgi_app(self.env, self.start_response)   file "/home/arslan/gae/google_appengine/google/appengine/tools/devappserver2/wsgi_server.py", line 250, in __call__     return app(environ, start_response)   file "/home/arslan/gae/google_appengine/google/appengine/tools/devappserver2/request_rewriter.py", line 311, in _rewriter_middleware     response_body = iter(application(environ, wrapped_start_response))   file "/home/arslan/gae/google_appengine/google/appengine/tools/devappserver2/python/request_handler.py", line 89, in __call__     self._flush_logs(response.get('logs', []))   file "/home/arslan/gae/google_appengine/google/appengine/tools/devappserver2/python/request_handler.py", line 225, in _flush_logs     apiproxy_stub_map.makesynccall('logservice', 'flush', request, response)   file "/home/arslan/gae/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 94, in makesynccall     return stubmap.makesynccall(service, call, request, response)   file "/home/arslan/gae/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 328, in makesynccall     rpc.checksuccess()   file "/home/arslan/gae/google_appengine/google/appengine/api/apiproxy_rpc.py", line 156, in _waitimpl     self.request, self.response)   file "/home/arslan/gae/google_appengine/google/appengine/ext/remote_api/remote_api_stub.py", line 200, in makesynccall     self._makerealsynccall(service, call, request, response)   file "/home/arslan/gae/google_appengine/google/appengine/ext/remote_api/remote_api_stub.py", line 226, in _makerealsynccall     encoded_response = self._server.send(self._path, encoded_request)   file "/home/arslan/gae/google_appengine/google/appengine/tools/appengine_rpc.py", line 393, in send     f = self.opener.open(req)   file "/usr/lib/python2.7/urllib2.py", line 406, in open     response = meth(req, response)   file "/usr/lib/python2.7/urllib2.py", line 519, in http_response     'http', request, response, code, msg, hdrs)   file "/usr/lib/python2.7/urllib2.py", line 444, in error     return self._call_chain(*args)   file "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain     result = func(*args)   file "/usr/lib/python2.7/urllib2.py", line 527, in http_error_default     raise httperror(req.get_full_url(), code, msg, hdrs, fp) httperror: http error 502: proxy error ( connection refused ) info     2013-07-17 20:55:24,534 module.py:595] default: "get /favicon.ico http/1.1" 500 - 

i getting same error in ms windows, switched ubuntu still getting this. , getting error after updated google app engine sdk 1.8.2, previous version working fine.

any guess why happening ?

thanks in advance.

well, using proxy , gae/python snippet checks update before running server , unable locate update server using proxy. thats why getting error. started using network without proxy , things started working :).