I have a login system for our intranet that uses cookies to keep track of logged in users. I wrote it about a month ago and haven't touched it since. On Friday, it was working fine (cookies are set for one hour so I logged in multiple times on Friday). Today when I logged in, it failed to actually set the cookie on my dev machine. I tried it on our production machine and it is failing as well. I've tried to login from machines I don't normally use and get the same results.
The production machine is Windows server 2008. My dev machine is Windows 7. Both are running xampp 1.7.3. I've checked git on both machines to make sure that no one has modified the code over the weekend and everything looks fine.
I'm completely at a loss. Does anyone have any ideas as to what could be causing this?