Proxy pop-up issue

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I wasn't sure where else to put this (wonderful) query so this poor forum gets it.

We have a user who frequently gets a pop-up requesting proxy authentication when she's browsing the internet.

She's a member of all the correct groups required for internet access in AD, and her colleagues around her in the same office don't get this problem. They all go through the same proxy server (though we have tried her on our backup proxy for completeness and the issue still occurs).

- We have swapped her device
- We have re-created her profile (which isn't roaming anyway)
- We have changed her NT account (not renamed, but given her an entirely new one)

The new NT account tested okay for 24 hours (tested by IT), but the testing was done without her Exchange mailbox added on. When we tagged on the Exchange mailbox, the pop-up re-appeared when she was browsing.

The original NT user account had an 11 character length, and her primary SMTP address was the same as her NT login (though I don't think or see any reason why Exchange in any form would be the culprit?)

We are really stumped now as to what might be the problem - any ideas? Her group memberships on the proxy, in AD, her internet settings, all match those of "working" users.

Halp!?

EDIT: the user has XP Professional SP2, and uses IE6. Upgrading to IE7 is not an option for us, though she has been tested on an IE7 machine (in IT) and the issue carries around.

 

Yeah all local IE settings (LAN settings, advanced et al) are configured to a master image. Users do not change these (and we double checked!)

I haven't checked her event log tbh - is there a way I can get to these on her PC without actually taking a remote session?

Thanks Craigie

 

Hokey I've checked the Event Viewer (waited till user had gone home) there is, unfortunately, nothing useful to speak of. No errors around the times the pop-ups have been reported, no nothing.

More halp!

 

Users are unable to change their own passwords; it hasn't been changed by IT.

 

That was eliminated with the brand-spanking new profile.

Just trying your suggestion now Qs

Yes, their kit has been fully swapped out with another fresh profile.

Will check on the proxy

 

Hey Qs

Kerberos/NTLM authentication was already selected.

 

Weird.

A few Qs...

What version of Outlook?
Is there any toolbars in IE that might be trying to update over the tinterweb?
Do you have the preview pane opened in Outlook, perhaps a HTML email is trying to access the web.

If you are still having problems I would exmerge the mailbox, delete the user account and mailbox, copy a account that works (and has similar security group memberships that the user needs) , then log in and set everthing up again. Also keep the existing mailbox as an archive for now and then test.

What proxy are you using btw?