hellie_vti_1979 -> Multiple Authentication Prompts when accessing external sharepoint (11.Nov.2011 11:57:59 AM)
I hope someone can shed some light on this issue.
We are behind an ISA 2006 Firewall. We are able to browse HTTP/HTTPS traffic from Internal to External, as long as we are authenticated users, which we ensure via the Firewall Client being installed on everybody's box. Everything works fine. When we try to access a certain remote Sharepoint site (not ours) we have the following issue:
When we attempt to access the remote SharePoint site via Internet Explorer (HTTP) from behind our ISA server, we authenticate once, and then are prompted to authenticate a few more times. Once the page loads, if you click on other links or buttons, you are prompted to input your credentials a few more times before the next page loads properly, which it does eventually for the first few pages. Eventually this behaviour repeats until you are served with a simply blank HTTP page. The ISA logs show a lot of "green" traffic that says Allowed Connection, but the traffic that shows when we are presented with the credential input box says "Status: 401 Unauthorized."
Now, if we attempt to access this same SharePoint site from the external world, we are asked to authenticate once, and that is the end of it. We can go about managing our site and exploring it like normal. The problematic behaviour occurs when the traffic comes from behind our ISA firewall.
One other piece of information that may be usefull is that we have this issue with following environment:
Windows XP (SP3) + IE7
Windows XP (SP3) + IE8
Windows Vista + IE7
Windows Vista (SP1) + IE8
With the same ISA server and access rules, same domainuser, same domaincomputer we don't have this issue when we use:
Windows XP (SP3) + Firefox
Windows Vista + Firefox
Windows Vista (SP2) + IE9
Windows 7 + IE8
Windows 7 + IE9
Windows 7 + Firefox
What did i try:
1. Place the external sharepoint site under local intranet zone in IE
2. Bypass proxy in IE for the external sharepoint site
3. Made a access rule to external sharepoint site and domain for all users
4. Changed the setting under local intranet zone > Security Tab>Select the Internet Zone>Custom Level> check "Automatic logon with current username and password.
= no luck
When i make a access rule: domaincomputer > external for all users then i can access the sharepoint site without the prompts.
Why it works with Windows 7 + IE8 and don't with XP + IE8, is perplexing me to great extents! If you can shed any light on this or help at all, I would be most gratefull.