Hello,
I have a similar issue - I just upgraded from 3.3.0 to 3.6.2
[2017/02/06 20:03:09 UTC] [EROR] websocket routing error: seq=1 uid= api.web_socket_router.not_authenticated.app_error [details: ]
[2017/02/06 20:03:09 UTC] [EROR] /api/v3/teams/5nc311cgnjnczcxm1g4hzg8oho/channels/sm9xx78b4jgupj6c1bi41fqpmh/posts/since/1486395590461: code=401 rid=1nfz9rufjirdpx5oopnxnsouje uid= ip= Invalid or expired session, please login again. [details: UserRequired]
Log is full of these entries. Couldn't be this just about some users left desktop app open before upgrade and now ws are failing, because users are not authenticated?
Thanks for reply
M.