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Team,

We are getting below IIS error in our beacon as agent is giving internal error 500. We are using 2021R1 on prem version.

Could not load file or assembly 'System.Web.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Take a look at the following article to see if it gives any inspiration for what might be going on here: Known Issue: HTTP 500 and "Could not load file or assembly" errors may occur after upgrading a beacon to version 2020 R2.2 (16.2) due to web.config file not being updated (IOJ-2183358)

With that said, you're using a beacon version that is theoretically not affected by this issue so I'm not sure if that article will directly apply or help.