[CentOS] basic auth fails

Hello,

I've setup apache basic auth on by web server to protect my nagios site. It's been working just fine, but suddenly it stopped accepting passwords even tho they are being typed in correctly. I was wondering if I could get some advice on how to troubleshoot this?

I'm on a centos 5.4 machine

Linux 2.6.21.7-2.fc8xen #1 SMP Fri Feb 15 12:34:28 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

Server version: Apache/2.2.21 (Unix) Server built: Nov 14 2011 18:03:07

I don't see any indication in the logs as to why this may be happening, but it's possible I might not be looking for the right things.

Thanks Tim

gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B