{"issue":{"milestone":null,"user":{"id":632049,"login":"cjw296","url":"https://api.github.com/users/cjw296","avatar_url":"https://secure.gravatar.com/avatar/276928028a2075ceeb0b7aface8e2e2a?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png","gravatar_id":"276928028a2075ceeb0b7aface8e2e2a"},"title":"Intermittent \"Exception: Mismatched MAC\"","created_at":"2011-12-15T10:18:55Z","labels":[],"updated_at":"2011-12-16T22:34:55Z","state":"open","id":2564998,"html_url":"https://github.com/fabric/fabric/issues/500","closed_at":null,"pull_request":{"patch_url":null,"html_url":null,"diff_url":null},"body":"Every so often, running a parallel set of fabric jobs, I get:\r\n\r\n\r\nERROR:ssh.transport:Exception: Mismatched MAC\r\nERROR:ssh.transport:Traceback (most recent call last):\r\nERROR:ssh.transport:  File \"build/bdist.linux-x86_64/egg/ssh/transport.py\", line 1529, in run\r\nERROR:ssh.transport:    ptype, m = self.packetizer.read_message()\r\nERROR:ssh.transport:  File \"build/bdist.linux-x86_64/egg/ssh/packet.py\", line 356, in read_message\r\nERROR:ssh.transport:    raise SSHException('Mismatched MAC')\r\nERROR:ssh.transport:SSHException: Mismatched MAC\r\nERROR:ssh.transport:\r\n\r\nAny idea what causes this and how I can stop it?","number":500,"url":"https://api.github.com/repos/fabric/fabric/issues/500","comments":1,"assignee":{"id":6088,"login":"bitprophet","url":"https://api.github.com/users/bitprophet","avatar_url":"https://secure.gravatar.com/avatar/f1acc6318028fdba9874c77bc622a2fb?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png","gravatar_id":"f1acc6318028fdba9874c77bc622a2fb"}},"comment":{"user":{"id":6088,"login":"bitprophet","url":"https://api.github.com/users/bitprophet","avatar_url":"https://secure.gravatar.com/avatar/f1acc6318028fdba9874c77bc622a2fb?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png","gravatar_id":"f1acc6318028fdba9874c77bc622a2fb"},"created_at":"2011-12-16T22:34:55Z","updated_at":"2011-12-16T22:34:55Z","id":3183562,"body":"This seems to be an edge case in parallel mode, as it has only been reported recently and only when that feature is enabled. I've got one other user reporting this + other intermittent `SSHError`s in parallel mode, who has neither problem in serial mode.\r\n\r\n@cjw296 can you share what your host list / fabfile looks like when you get these errors? I recognize that it's intermittent but every bit of data helps. (Also, what version of Fabric/ssh/Python you're on.)","url":"https://api.github.com/repos/fabric/fabric/issues/comments/3183562"},"action":"created"}