403 Forbidden and Forms Authentication with MOSS


We have a public MOSS site setup to use Forms Authentication for protected content. When the user hits files in certain document libraries, the user is automatically redirected to the login page and then returned to the document after a successful login. However, for some users, when they click a link to view a protected file they are not redirected to the login page and a “403 Forbidden” error message is displayed in Internet Explorer. This behavior does not occur in non-IE browsers (Firefox, Safari).

After some research I found this article. It looks like the culprit is a Microsoft add-in for Office Live.

Fix: Uninstall the application called “Microsoft Office Live Add-in 1.3”. That solved the problem right away. No system reboot or browser restart necessary…

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5 Responses to “403 Forbidden and Forms Authentication with MOSS”

  1. Kevin Says:

    So Kerry – you’ve made all the clients remove the Add-In?

    I’m facing the same situation but it doesn’t seem reasonable to demand that the clients remove something totally irrelevant because of faulty behavior on the server side.

    Your thoughts ?

    • Kerry Says:

      I agree it’s not a reasonable solution but it’s the only solution that I’ve found at this time. A server-side fix would obviously be the preferred solution.

  2. Neil Pritchard Says:

    Just to say that we have built a Sharepoint 2007 server using the latest updates and we still have clients encountering the same problem. Specifically anyone with Windows 7 and IE8, (and any version of Office Live addin-in eg 1.4). The only fix we have found is to uninstall Office Live Add-in. Or to switch your browser to Google Chrome, Firefox.

  3. Kerry Says:

    There is a supposed hotfix for this from Microsoft that’s been out since July 2009. http://support.microsoft.com/kb/972535/
    I haven’t tried it yet

  4. varun Says:

    I found following entries in my proxy by pass setting “;”
    removing it has solved my problem


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