IIS / Security / SharePoint 2010
NTLM, keep alive connections and the 401.1 loop
An authentication prompt that never resolves can be a connection behaviour problem hiding behind a credential problem.
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IIS
Web server behaviour, authentication loops and the request path before SharePoint receives a call.
Many SharePoint faults begin below the SharePoint layer. This topic looks at IIS, authentication and connection behaviour with an eye on the evidence each one leaves behind.
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Outside reading
Useful references
Keep the current product documentation close when applying advice from an older entry.
- Microsoft Learn: IIS documentation (opens in a new tab)Reference material for web server configuration, authentication and diagnostics.
- Microsoft Learn: Windows Server documentation (opens in a new tab)Current guidance for Windows Server roles, networking, storage and management.
- Microsoft Support (opens in a new tab)Support articles, troubleshooting steps and product help from Microsoft.
- Microsoft Security Response Center (opens in a new tab)Security advisories, update guidance and vulnerability response information.
- Microsoft Learn: SharePoint documentation (opens in a new tab)The starting point for current SharePoint administration, development and hybrid guidance.
- Microsoft Learn: SharePoint administration (opens in a new tab)Operational guidance for service settings, site management and the modern admin experience.
- Microsoft Learn: SharePoint search (opens in a new tab)Documentation for search architecture, crawling and result management.
- Microsoft Learn: PowerShell documentation (opens in a new tab)Language reference, cmdlet documentation and guidance for repeatable automation.