Return
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Title
"The request failed with HTTP status 401: Unauthorized" error when connecting to Sharepoint. -
Description
"The request failed with HTTP status 401: Unauthorized" error when connecting to Sharepoint.
- MEWS and Windows Authentication
- Auto Authentication
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Cause
The "401 Unauthorized" error can be caused by the following:
- There may be insufficient permissions in web application user policy for the connecting user account.
- More than one authentication providers are configured on the Web Application in SharePoint.
- Connections switching between WFE servers due to session affinity (sticky sessions) settings of the Network Load Balancer.
- There may be a mismatch in anonymous access settings in IIS Manager vs SharePoint Web Application.
- The SharePoint web application uses “NTLM” authentication instead of Kerberos authentication and has anonymous access enabled in IIS Manager.
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Resolution
Workaround
- Grant direct explicit (Not through a group but through an individual account) full control permissions through Web Application user policy to the connecting user account (For example Quest\Peter).
- If step 1 doesn't work, try connect at Farm level using a Farm Admin account. Next drill down and see if SharePoint can connect Or still get the 401 Unauthorized error.
- Connect directly to SharePoint Web Server by configuring a host file entry on the machine running Content Matrix to bypass the Network Load Balancer.
- Consider disabling the Anonymous access in IIS manager if anonymous access setting is not enabled on the affected Web Application in SharePoint.
- If the above steps did not work, implement Negotiate (Kerberos) authentication on the affected SharePoint Web Application, refer to here.
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