Nginx WHMCS 500 errors

Getting WHMCS 500 errors, wonder if you guys can help.

php config:
display_errors = On
error_reporting = E_ALL

shows no errors, still just a plain blank page on Firefox & Safari, on Chrome it shows its custom 500 error page. Nothing in PHP or nginx error logs. Access logs don't show request. No firewall blocking requests. Other software on same VPS works fine, XenForo, WordPress, custom Laravel install, but WHMCS doesn't. PHP version is 5.6, also supported by WHMCS v6.

---

 

And I do have the ioncube for PHP 5.6 installed, yeah

 

Restarting doesn't help, sadly :/

 

chown'd to web user

 

yeh, it's not like my custom 500 error, it's a:

Code:

server {
            listen   80;
            server_name domain;
            return 301 https://domain$request_uri;
       }

server {
  listen 443 ssl;
  server_name domain;

# ngx_pagespeed & ngx_pagespeed handler
#include /usr/local/nginx/conf/pagespeed.conf;
#include /usr/local/nginx/conf/pagespeedhandler.conf;
#include /usr/local/nginx/conf/pagespeedstatslog.conf;

ssl on;
ssl_certificate /usr/local/nginx/conf/ssl/domain.crt;
ssl_certificate_key /usr/local/nginx/conf/ssl/domain.key;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK;
ssl_prefer_server_ciphers on;
#ssl_session_cache shared:SSL:10m;
#ssl_session_timeout 10m;

  # limit_conn limit_per_ip 16;
  # ssi  on;

  access_log /path/to/domain/log/access.log combined buffer=32k;
  error_log /path/to/domain/log/error.log;

  root /path/to/domain/public;
  index index.php;

  location / {
try_files $uri $uri/ $uri.php;
# Announcements
#rewrite ^/announcements/([0-9]+)/[a-zA-Z0-9-]+\.html$ /./announcements.php?id=$1 last;
#rewrite ^/announcements$ /./announcements.php last;
# Downloads
#rewrite ^/downloads/([0-9]+)/([^/]*)$ /./downloads.php?action=displaycat&catid=$1 last;
#rewrite ^/downloads$ /./downloads.php last;
#Knowledgebase
#rewrite ^/knowledgebase/([0-9]+)/[a-zA-Z0-9-]+\.html$ /./knowledgebase.php?action=displayarticle&id=$1 last;
#rewrite ^/knowledgebase/([0-9]+)/([^/]*)$ /./knowledgebase.php?action=displaycat&catid=$1 last;
#rewrite ^/knowledgebase$ /./knowledgebase.php last;

# block common exploits, sql injections etc
#include /usr/local/nginx/conf/block.conf;
  }

  include /usr/local/nginx/conf/php.conf;
#  include /usr/local/nginx/conf/drop.conf;
}

 

php logs show nothing

 

I disabled it temporarily to see if it was causing WHMCS issues and I'm not sure what the ocsp stapling data is for PositiveSSL COMODO certificate

Tried, no errors shown or produced. Once enabled, where are errors logged? On the screen or the respective error.log files?

chown'd properly with correct file perms, just in case I did a chmod to 777 and it didn't fix any of it.

It is 128MB

what does nginx debug mode do?

I did last night. The install went fine, actually. An upgrade to WHMCS v6.2 from v6.0.3. The installer said I pass all requirements and said the upgrade completed successfully. After, it said remove the install directory to begin using WHMCS, as it's a security concern. I did, and then the blank pages and 500 errors started.

 

I managed to fix it, basically stupid WHMCS software, not much to do with the system itself. WHMCS is just a bunch of obfuscated code that has no application logs, so when 500 errors happen they say it's your system. When you're puzzled why it's not being logged, it's because it's application side (bad WHMCS hooks) which isn't logged anywhere because they handle all logging but don't show the end user any of it!

I'll look into OCSP stapling. Any info on enabling it with PositiveSSL w/ nginx?