I have updated my CFG and get 502 gateway problem with the following line:
connect() failed (111: Connection refused) while connecting to upstream
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Dear Sir, I can fix your this problem about connect() failed (111: Connection refused) while connecting to upstream as having good experience of nginx setting and configuration.
As per understanding from your brief description, I think I can easily make your wish done with my skills level contact me once and I guarantee it that you will get the perfect solution for your need.