Here is my problem. We are using ISA server and one site had become unavaliable 3 days before. Nothing changed in ISA , I was not at the office. It is a bank's site that was working just fine with our ISA for over a year.
When I try to connect to the site ISA returns connection timeout error.
We can enter the site using dial up without a problem.
I tried connecting with ip address but couldn't, also.
Our ISP can connect without a problem.
Only ISA part is left. I configured a rule for full access to that side including ip address but it did not work.
I can trace the web site with our router, it does not give timeout.
You might set the MTU on the ISA server lower than the default max 1500
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