One problem I've had randomly come and go over the past two years occurs when I'm using Ubuntu Linux on my university's network. I log in through a web browser, and at some point between the next 20-30 seconds or so, I am redirected to the log-in screen and must re-authenticate. I can not find any explanation for why this happens or how to authenticate properly again, and this is the last resource at my disposal for solving this problem. Does anyone have a hint of what could be going on or at least where I could look to find out? Thanks.
I have this problem too.