I usually try to avoid vendor issues but I wanted to run this by the forum to see if by chance anyone has run into this...
We have a PIX 515 with 6.3(5), and are using a CipherTrust IM Mail Filtering Appliance. For whatever reason, outbound connections from the IM will fail after a certain period of time.
Now in case you're thinking the obvious (ACLs, equipment) I've already addressed it, swapping out the switch, network cable, allowing full IP to and from the IM. Still for whatever reason, outbound connections are dropped. I traced packets and the SYN packet is sent, but that's it. No response. No indication of a Denied ACL. The end result is a SYN timeout. Now when I resart the PIX, it will work fine for a few hours and then connections from the IM to the internet will be dropped again.
Odd. Any help would be greatly appreciated.