Potential issue with logins

I ran into an interesting issue tonight, and I'm not sure what to make of it yet. Let me try and explain.

I was at home, working normally tonight, and decided to go out to the bar and have a drink (both bars I frequent here have wireless networks that I set-up for them -- I like to be able to work while I drink and socialize. I know supergeek!). I didn't shut off my computer, just closed the laptop, sent it snoozing, and went on my merry way. When I arrived at the bar and started working, everything seemed to work fine. But when I went to login to the Etomite manager on ANY external site (local instances setup for loopback testing worked fine) I have deployed, I was unable to login. It looked like it was trying but after several minutes, it came back with a dialog that proclaimed `Document contained no data`. I could understand if I was logged in by IP address to a particular site why this issue might arise (e.g. session tied to IP), but this affected every single Etomite manager I had access to.

Any ideas? A quick reboot solved the issue, but I'm not sure I understand why it arose. Probably nothing major to worry about, but it also affected web user logins.