Hi djromanello,
CAUSE:
====================
1. It happens if we have customization on the site and we have WSE 2.0 installed on the site.
(WSE 2.0 - Web services Enhancements)
2. The WSE is the add-on for Microsoft Visual Studio® .NET.
3. If we have the WSE 2.0 installed on SharePoint server
then following entry gets added in web.config file of ISAPI folder.
(C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\ISAPI\ )
<soapExtensionTypes>
<add type="Microsoft.Web.Services2.WebServicesExtension,Microsoft.Web.Services2,Version=2.0.0.0,Culture=neutral,PublicKeyToken=31bf3856ad364e35" priority="1" group="0" />
</soapExtensionTypes>
RESOLUTION/WORKAROUND:
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1. Deleted the above entry from the web.config file of ISAPI.
(C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\ISAPI\ )
(Note: Make sure that it won't affect the customization)
STEPS TO REPRO:
====================
1. Install WSE 2.0 on your SharePoint server
and make sure that we have following entry added in web.config of ISAPI folder
<soapExtensionTypes>
<add type="Microsoft.Web.Services2.WebServicesExtension,Microsoft.Web.Services2,Version=2.0.0.0,Culture=neutral,PublicKeyToken=31bf3856ad364e35" priority="1" group="0" />
</soapExtensionTypes>
MORE INFORMATION:
====================
you can download WSE 2.0 with SP2 from the following web site:
http://www.microsoft.com/downloads/info.aspx?na=22&p=2&SrcDisplayLang=en&SrcCategoryId=&SrcFamilyId=&u=%2fdownloads%2fdetails.aspx%3fFamilyID%3dfc5f06c5-821f-41d3-a4fe-6c7b56423841%26DisplayLang%3den
Thanks,
Lhan