Ajay,
You're looking at the wrong bit of the wrong log - that's your metadata log showing a connection from an internal user used by Environment Manager.
Assuming you're on 9.4 (because of said sasevs user), you should check server.log under Lev1/Web/WebAppServer/SASServer1_1/logs. There will be exceptions in there that hint to the underlying problem.
Alternatively, if it worked until a couple of days ago then a restart of SASServer1 may fix your issue.
Nik
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