{"action":"opened","issue":{"url":"https://api.github.com/repos/ipython/ipython/issues/8094","labels_url":"https://api.github.com/repos/ipython/ipython/issues/8094/labels{/name}","comments_url":"https://api.github.com/repos/ipython/ipython/issues/8094/comments","events_url":"https://api.github.com/repos/ipython/ipython/issues/8094/events","html_url":"https://github.com/ipython/ipython/issues/8094","id":63122847,"number":8094,"title":"ipython notebook stopped working","user":{"login":"abell25","id":1977241,"avatar_url":"https://avatars.githubusercontent.com/u/1977241?v=3","gravatar_id":"","url":"https://api.github.com/users/abell25","html_url":"https://github.com/abell25","followers_url":"https://api.github.com/users/abell25/followers","following_url":"https://api.github.com/users/abell25/following{/other_user}","gists_url":"https://api.github.com/users/abell25/gists{/gist_id}","starred_url":"https://api.github.com/users/abell25/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/abell25/subscriptions","organizations_url":"https://api.github.com/users/abell25/orgs","repos_url":"https://api.github.com/users/abell25/repos","events_url":"https://api.github.com/users/abell25/events{/privacy}","received_events_url":"https://api.github.com/users/abell25/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-03-20T00:20:45Z","updated_at":"2015-03-20T00:20:45Z","closed_at":null,"body":"Hi, I have been using ipython notebook for a few months.  I can login and navigate to a notebook but as soon as I issue a command like 1+1 it just hangs and the console gives this stack trace:\r\n\r\nINFO:tornado.access:302 GET / (127.0.0.1) 1.27ms\r\nINFO:tornado.access:302 POST /login?next=%2F (127.0.0.1) 3.65ms\r\n2015-03-19 19:16:26.042 [NotebookApp] Saving notebook at /OttoGroup.ipynb\r\nINFO:tornado.access:302 GET / (127.0.0.1) 0.78ms\r\n2015-03-19 19:17:01.525 [NotebookApp] ERROR | Unhandled error in API request\r\nTraceback (most recent call last):\r\n  File \"/home/tony/anaconda/lib/python2.7/site-packages/IPython/html/base/handlers.py\", line 336, in wrapper\r\n    result = method(self, *args, **kwargs)\r\n  File \"/home/tony/anaconda/lib/python2.7/site-packages/IPython/html/services/sessions/handlers.py\", line 65, in post\r\n    kernel_id = km.start_kernel(path=path)\r\n  File \"/home/tony/anaconda/lib/python2.7/site-packages/IPython/html/services/kernels/kernelmanager.py\", line 90, in start_kernel\r\n    kernel_id = super(MappingKernelManager, self).start_kernel(**kwargs)\r\n  File \"/home/tony/anaconda/lib/python2.7/site-packages/IPython/kernel/multikernelmanager.py\", line 116, in start_kernel\r\n    km.start_kernel(**kwargs)\r\n  File \"/home/tony/anaconda/lib/python2.7/site-packages/IPython/kernel/manager.py\", line 219, in start_kernel\r\n    self._connect_control_socket()\r\n  File \"/home/tony/anaconda/lib/python2.7/site-packages/IPython/kernel/manager.py\", line 179, in _connect_control_socket\r\n    self._control_socket = self.connect_control()\r\n  File \"/home/tony/anaconda/lib/python2.7/site-packages/IPython/kernel/connect.py\", line 552, in connect_control\r\n    return self._create_connected_socket('control', identity=identity)\r\n  File \"/home/tony/anaconda/lib/python2.7/site-packages/IPython/kernel/connect.py\", line 529, in _create_connected_socket\r\n    sock.connect(url)\r\n  File \"socket.pyx\", line 471, in zmq.backend.cython.socket.Socket.connect (zmq/backend/cython/socket.c:4264)\r\nZMQError: Invalid argument\r\nERROR:tornado.access:{\r\n  \"Origin\": \"https://127.0.0.1:53209\", \r\n  \"Content-Length\": \"49\", \r\n  \"Accept-Language\": \"en-US,en;q=0.8\", \r\n  \"Accept-Encoding\": \"gzip, deflate\", \r\n  \"Connection\": \"keep-alive\", \r\n  \"Accept\": \"application/json, text/javascript, */*; q=0.01\", \r\n  \"User-Agent\": \"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36\", \r\n  \"Host\": \"127.0.0.1:53209\", \r\n  \"X-Requested-With\": \"XMLHttpRequest\", \r\n  \"Cookie\": \"username-127-0-0-1-53209=\\\"2|1:0|10:1426810575|24:username-127-0-0-1-53209|48:MmViMTBkMWYtMjI2Ni00NGM5LTkzNmEtMTZjNjUxNjhjMTdi|4b190ce9b6859b933d2c7c941a52b47d147b50557e8333e7ca12a4143e7a7542\\\"\", \r\n  \"Referer\": \"https://127.0.0.1:53209/notebooks/OttoGroup.ipynb\", \r\n  \"Content-Type\": \"application/x-www-form-urlencoded; charset=UTF-8\"\r\n}\r\nERROR:tornado.access:500 POST /api/sessions (127.0.0.1) 12.24ms referer=https://127.0.0.1:53209/notebooks/OttoGroup.ipynb\r\n2015-03-19 19:19:02.048 [NotebookApp] Saving notebook at /OttoGroup.ipynb\r\n"}}