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plesk 502 bad gateway error

I am frequently getting this 502 bad gateway error, because of this my site becoming unavailable. Please help me how to solve this problem. I am using plesk on centOS 7, this error came in debian 8 also. I am using plesk 12.5, i tried 17.0.10 (preview version), this error came in that also. Please let me know how to resolve this problem.
 
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