Resolved Nginx 502 error , how can I fix it ?

[qtwrk]

Nginx 502 error , how can I fix it ?

everything was fine until yesterday I installed cloudflare mod to get real IP
last night when i went to sleep it was fine , and this morning it gives me 502 error.

this is log , I google'd a little , but seems the solution I found was about Nginx + PHP , didn't say anything about Nginx + apache + php...

 

[UFHH01]

Hi qtwrk,

pls. use the => FORUM SEARCH, due to the fact that your issue has been discussed quite often here in forum.

=> Search Results for Query: 502 Bad Gateway Connection refused | Plesk Forum​

 

[qtwrk]

thanks for the tip , I managed , it was server's public IP instead of 127.0.0.1 got banned by fail2ban
I post solution here in case someone run into same problem and just searched this post.