homepage Welcome to WebmasterWorld Guest from
register, free tools, login, search, pro membership, help, library, announcements, recent posts, open posts,
Pubcon Platinum Sponsor 2014
Home / Forums Index / Code, Content, and Presentation / HTML
Forum Library, Charter, Moderators: incrediBILL

HTML Forum

NTLM login via Chrome can kill the IIS server
Chrome can cause authentication loop in IIS, killing the server

5+ Year Member

Msg#: 4059813 posted 1:14 pm on Jan 13, 2010 (gmt 0)

If you try to access a NTLM secured website on IIS via Chrome you will have to authenticate.

If you use the following structure user@domain the server is getting in an authentication loop or something, and will continue to produce like 1500 401 errors per second till your disk is full. After restarting the service you can get out of the loop.


How do I prevent for now Chrome brouwsers to be able to login? Block the browser?



WebmasterWorld Senior Member fotiman us a WebmasterWorld Top Contributor of All Time 5+ Year Member

Msg#: 4059813 posted 3:14 pm on Jan 13, 2010 (gmt 0)

It appears to be a known issue [google.com] that Google Chrome doesn't work with NTLM authentication.
Google writes:

We're investigating this issue and will announce updates in the help forum when we have more information.

Note, there is a button on the Known Issues page to report that you are having this issue.

I don't know enough about configuring IIS to block Chrome browsers, though.


WebmasterWorld Senior Member 10+ Year Member

Msg#: 4059813 posted 5:12 pm on Jan 13, 2010 (gmt 0)

Here is an option, the URLScan tool:

You can block User Agents under the [DenyHeaders] section. (I haven't tried this myself though)


WebmasterWorld Administrator 10+ Year Member Top Contributors Of The Month

Msg#: 4059813 posted 11:04 pm on Jan 13, 2010 (gmt 0)

What version of Chrome are we dealing with? I know the latest version I just downloaded ( doesn't seem to have any problems. I tested it against an internal website (sharepoint) which uses NTLM to secure it. Could it be an older version that is causing the problems or a Chrome spoof?

What version of IIS, and OS?

Global Options:
 top home search open messages active posts  

Home / Forums Index / Code, Content, and Presentation / HTML
rss feed

All trademarks and copyrights held by respective owners. Member comments are owned by the poster.
Home ¦ Free Tools ¦ Terms of Service ¦ Privacy Policy ¦ Report Problem ¦ About ¦ Library ¦ Newsletter
WebmasterWorld is a Developer Shed Community owned by Jim Boykin.
© Webmaster World 1996-2014 all rights reserved