Weird issue with Pix blocking traffic.

[netadmin]

I am working along today when I start noticing that a few of the pages I was looking at would not load the first time.. Then all of a sudden I could go to google's website but not msn or yahoo. I could ping all of the sites but could not traceroute. As I was trying to figure out where the problem was at I was changing routers and I powered down my PIX and brought it back up.. This fixed the issue, but I don't know why or how it had problems to begin with since I had made no changes to it recently. Anyone have any ideas why the pix might start blocking certain traffic all of a sudden?

[nkhawaja]

What version of PIX OS? any syslog messages? are you using URL Filtering? What is your fixup DNS settings looks like. Any traffic statistics from the PIX at the time of the issue.

[netadmin]

Pix OS = 6.2(2)

A few syslog messages denying inbound traffic but nothing major and I don't see any times to determine when they occured. I am not using URL filtering and there is no entry whatsoever for fixup DNS. There doens't appear to be any traffic statistics.