Yesterday I was asked to assist in troubleshooting an issue with a SharePoint web service. The SharePoint indexing process failed to work properly for just one web application. Some investigation revealed that the indexer was unable to open the sitedata.asmx web service. When trying to open the same web service via IE, I was prompted for credentials however whatever credentials were entered, after three attempts an "Access Denied" page (401.1 error) was shown.
[SOLUTION]
Unfortunately Process Monitor didn't reveal anything and I noticed that the sitedata web service wasn't the only web service that failed. After some troubleshooting I found out that the cause was in the web config:
The "remove verb *.asmx" line was placed after the "add verb *.asmx" line in the httphandler setting, essentially removing the configuration after adding it. For example:
<add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />After correcting this by placing the remove line in front of the add line, all web services started working just fine!
....
<remove verb="*" path="*.asmx" />
<remove verb="*" path="*.asmx" />
....
<add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
[EXPLANATION]
Why is this happening? By first placing the remove line, you make sure any declarations that are done in other (global) configuration files are made void. That way you know for sure that no conflicts will occur between two configurations. However after removing the asmx httphandler, you have to declare it again, else SharePoint (or better yet IIS) does not know how to handle the asmx file. The confusing part for this issue is that it will display an authentication prompt to the user, without it actually being an authentication issue.
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