So our client is using a Cisco ASA and they are having occasional "Page cannot be displayed" errors. We have determined through lots of troubleshooting that our firewall doesn't like the ASA reusing port numbers within ~2-4 minutes time with a sequence number that is lower.
We know you can change the ASA to not randomize sequence numbers but is it possible to have the ASA not use the same port within a certain amount of time?
Note: We are working with our Firewall Vendor to see if we can get around it on our end instead of theirs.
Thanks, - Vince