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In my SharePoint Foundation server, in event viewer we often find error

Id : 8306

An exception occurred when trying to issue security token: The HTTP request is unauthorized with client authentication scheme 'Negotiate'. The authentication header received from the server was 'NTLM'..

Event Viewr

I configure IIS settings and Provision security token service as per this Link

One annoying thing I found with my Security Token service:

When I opened from IIS > Sharepoint Web service > Security token service > Browse in browser I get a HTTP Error 503. The service is unavailable. error

2

Try this :

$hostSvc = Get-SPServiceHostconfig

$hostSvc.Provision()

$SecToken=Get-SPServiceApplication | where { $_.TypeName -Like “Security Token*”}

$SecToken.provision()

You can restart IIS ( IISReset.exe) or use the below PS to restart single IIS Site.

Stop-Website “SharePoint Web Services”

Start-Website “SharePoint Web Services”

https://sharepointumar.wordpress.com/2017/09/16/500-internal-server-error-event-id-8306-6398-sharepoint-2016/

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