IE Authentication prompt

[Guest]

Hi All

We have a strange issue:

Users are occasionally being prompted for their domain login while trying to
access intranet sites that use Integrated Authentication. This isn't
consistent, as some days it will happen and other days it won't.

The sites are accessed using their FQDN so e.g. http://home.mydomain.com.
Both client machines and servers are in same domain.
IE's intranet zone is configured to include all the sites in the bypass
proxy list. The domain name mydomain.com is included in that list. A GPO
pushes that IE configuration to the desktop.

I'm aware that IE will prompt for user details on FQDN's unless specifically
included in the Intranet zone but as the GPO includes this domain in the
bypass proxy list I would expect this to work.

What is frustrating is the inconsistency. If it continually happened then I
could understand it but on Monday you will get prompted and on tuesday you
won't. The users haven't logged out in between either.

Anyone got an idea on this ?

Thanks

 

[Jon Kennedy]

See this article for possible help:

Internet Explorer May Prompt You for a Password
http://support.microsoft.com/kb/258063/en-us

Other possible useful info for your situation:

Intranet site is identified as an Internet site when you use an FQDN or an
IP address
http://support.microsoft.com/kb/303650/en-usInternet

Explorer Uses Proxy Server for Local IP Address Even if the "Bypass Proxy
Server for Local Addresses" Option Is Turned On
http://support.microsoft.com/kb/262981/en-us

Also, make sure password caching is not disabled:

How to disable Internet Explorer password caching
http://support.microsoft.com/kb/229940/en-us