Thanks for your reply but what am I looking for specifically. I already checked the logs but there are many entries and many files in both
/usr/local/apache/logs (main logs)
/usr/local/apache/domlogs (per domain logs are in the same file for apache&nginx)
But I could not realized what the problem is. I thought it was something about file permission or ownership but I already attended this so I suppose it is something about any rule on nginx server I am not aware of.
I am using both Apache and Nginx as a Reverse Proxy and Nginx is not following the Symlink properly.
HTTP: Nginx (80) --> Apache (8181)
HTTPS: Nginx (443) --> Apache (8181)
404 Not Found
nginx/1.18.0