ISA 2004 proxy clients sometimes don't display web pages properly

In specific, a popup window from will usually show 'page cannot be displayed' when a client on our LAN is browsing through our proxy, however occasionally it will work.  It seems that it always works when connected directly to the internet.  Any troubleshooting suggestions for this annoying issue?
ISA Alerts monitoring doesn't show anything related to this.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

If ISA is the problem then it will either work,...or it won't.  There won't be any "occasionally it works".

There is more to the error than "page cannot be displayed".  When you read the whole error it will tell you why it failed.  You may have to disable "Friendly Error Messages" in the Advanced Settings of the browser.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
acesover2000Author Commented:
Right on.. I'll buy that for a dollar.
acesover2000Author Commented:
Somehow I find it hard to believe that all ISA servers definitely work or don't work, and that there aren't issues that can cause intermittent errors, but in lieu of supporting that argument, I'll buy into it as "it's so rare for ISA to have intermittent issues that it's worth ignoring that as a possible cause"
What does that mean???  
A "B"??  
I had not even got to an answer yet!  I was asking for more troubleshooting detail that would be gleaned from the browser's error message.  If you don't want to help someone gather the information they need to deal with the problem,...then that is your problem,...not mine.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Server Apps

From novice to tech pro — start learning today.