After my Windows Server 2008 machine has been running for a couple of hours as a web server, I can no longer log into the machine. I've tried using remote desktop, and I tried using a keyboard/mouse/monitor set directly connected to the machine.
Ctrl-Alt-Del brings up the sign-in screen, and I can enter a user id and password, but when I type enter to log in, it comes immediately back to the sign-in screen.
This machine is running a web service that continues with no apparent problems when this log-in failure scenario occurs. And that's good, but I'd prefer not to have to power cycle the machine to install new versions of the web service software.
I've been using this machine and this web software for a year with no problems. The "can't log-in" scenario started a few days ago.