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GitLab shows 502 after update

Today I upgraded my gitlab testing server machine to the new version from 9.3.6 (omnibus). After the update, I tried to reach the gitlab un website. But I get 502 Whoops, GitLab is taking too much time to respond. error message on the browser screen.

I increased the unicorn worker to 6 and timeout to 300 for 6 GB RAM machine. But again I facing the same problem.

Can you give me a way overcome this issue? Which log file you want to check this?