Recently one of our project faced performance issue in newly installed & configured on-premises SharePoint 2013 farm. I have looked in to this problem and came to know something interesting, so I am sharing my experience with you all. Problem statement The SharePoint servers had frequent 8321 events error related to certificate validation. It turns out that SharePoint periodically checks the validity of the Security Token service certificates used for signing security tokens. To check the validity of these certificates the server tries to connect to the Internet and if there is no connectivity from the server to the Internet, it takes 15 sec before the connection attempt times out. This majorly impacts the overall performance of the SharePoint farm. Solution http://support.microsoft.com/kb/2625048 is a KB article describing the issue. This is relevant since our servers do not have Internet connectivity. Per the suggestions in the document, I first tried importing the ce...
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