Authentication window on Intranet Site keeps popping up


I've got an internal application running on our IIS Server. AD authentication is used. All users are on the domain but the authentication window keeps popping up.

It can't be the code because the same app runs on the server on a different location. Server OS, IIS version and IE7, all the same.

Any ideas why this keeps happening? Is it possible that Kerberos has any issues?

Any help is much appreciated.

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pndoyleukConnect With a Mentor Author Commented:
It was an issue with the application itself.
Thanks a lot for your suggested solutions.

Just to clarify... ALL users continue to get the authentication window? Can they access the site, but it just keeps popping up asking for authentication over and over?
pndoyleukAuthor Commented:
Yes, there is a delay on it until the content shows up, it just seems like the site is slow, but eventually it opens up. After seconds, sometimes minutes, the authentication window pops up.

I noticed, I get "error on page" message in the status bar saying:

Line: 605
Char: 13
Error: Sys.WEbForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common cause for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trade is enabled.
Details: Error Parisng near 'could not log you on'
Code: 0
Url: http://IP/X/X.aspx     

 X standing for our URL details

I can't really say what this error message referes to.

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pndoyleukAuthor Commented:
Has anyone come across this yet?
What browser are you using?  
if IE 7, try Tools-->Options-->[advanced tab]--> mark to "enabled windows integrated login".
pndoyleukAuthor Commented:
Yes, This option is set correctly.

The strange thing is, the exact same code was working already and the same code is working in a different but similar environment.
Could there be a problem with our Domain? Thinking about Kerberos or something like that?

2 DC's, IIS running on a third server?

Thanks for your help
pndoyleukAuthor Commented:
Just to answer your question,

Yes, we are using IE7
Were any patches applied recently to the server or clients?
Try putting the site in the trusted sites zone in the client computer.  If the site is not Https://, you'll have to uncheck the box to 'Require server verification (https://) in this zone before it will let you add it.

Also, you might try checking the security logs on the web server, DC, and client to see if any errors are generated about the time the prompt occurs.   Perhaps the web server or client aren't getting their authentication from the DC correctly.


pndoyleukAuthor Commented:
No patches have been applied recently.

Site is in the Intranet Zone as it is an internal application.
Running on the same domain,
userauthentication is set to "integrated Windows authentication" on the IIS.

Changed the link to http://application/bla/bla.aspx

Still it's randomly prompting for authentication...

This is really frustrating. The Security logs don't show any sign of problem either.....

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