Just set a VPS with this guide: "https://www.howtoforge.com/tutorial/perfect-server-ubuntu-18.04-with-apache-php-myqsl-pureftpd-bind-postfix-doveot-and-ispconfig/". Everything looked perfect! but I started to notice (as I populated the server) that AJAX/jQuery where not functioning properly. mostly when posting "ajax/post".
My logs don't show much regarding this error. chrome's inspector tool shows:
"Failed to load resource: the server responded with a status of 500 (Internal Server Error)"
I have been searching for solution all over the internet and still can't have a clue on what is going on... Is there a tool to check server settings? some kind of debugger that I can use to find out how to spot the problem?? Please help me with this...
Update: I found this:
root@hs1:/var/run/apache2# apache2 -S
[Fri Jun 21 17:35:49.287125 2019] [core:warn] [pid 23275] AH00111: Config variable ${APACHE_RUN_DIR} is not defined
apache2: Syntax error on line 80 of /etc/apache2/apache2.conf: DefaultRuntimeDir must be a valid directory, absolute or relative to ServerRoot
but my /etc/apache2/envvars sais:
# temporary state file location. This might be changed to /run in Wheezy+1
export APACHE_PID_FILE=/var/run/apache2$SUFFIX/apache2.pid
export APACHE_RUN_DIR=/var/run/apache2$SUFFIX
export APACHE_LOCK_DIR=/var/lock/apache2$SUFFIX
