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Solution to HTTP 403

  Asked By: Gregory    Date: May 08    Category: Sharepoint    Views: 12908

I found a solution to the 403 Forbidden (event id 1314) errors.
Microsoft Support couldn't fix it but my two minute session with
SysInternal's FileMon revealed the cause:

--> w3wp.exe attempts to access the bin/ directory of the webapplication
in context of the requesting (non-admin) user and fails with an access
denied.

SYMPTOMS

* User (non admin) wants to create a new list item (eg
calenderitem, ...) or upload a file and sees a 403 Forbidden. The 'new'
page is not show.
* User (non admin) wants to edit a list item (eg blogpost) and
sees a 403 Forbidden. The 'edit' page is not shown.
* A Farm Administrator has NO issues with these 'new'/'edit' pages
and is able to edit and save content.

CAUSE
w3wp.exe (IIS worker process for ASP.NET) tries to look into the /bin
directory in the context of the requesting user account (impersonation),
but fails for non-admin users. The bin/ directory is not readable for
normal users but is readable for administrators. I believe this is an
ASP.NET 2.0 bug that is related to KB 928365. This hotfix is removed
when you install .NET 2.0 Service Pack 1. SP1 contains the solution from
KB 928365 and thus the problems continue.
I don't think WSS3/MOSS or WSS3/MOSS Service Pack 1 causes this issue.

WORKAROUND/SOLUTION
Making sure your normal user accounts can access the /bin directory in
the webapplication:

* On the server, open an Windows Explorer for the /bin directory
of your webapplication and display its properties.
* On the security tab, add the local server group "SERVER\Users"
to the list, ("SERVER\Users" usually contains "DOMAIN\Users") and select
the following rights for "SERVER\Users": "Read & Execute", "List Folder
Contents", "Read". Click OK to apply the new settings.

The 403's should now be gone.
Do this for every webapplication in your farm.

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