Debian with ISPConfig - proc.num not working

[tuxmartin]

Hi, I have server with Debian 8.10, kernel 3.14.32 and ISPConfig 3.1.11. I did not install the server.


I have problem with "proc.num" - not working. All proc.num items show 0. (proc.num[,root,,"cron"] show 0, but cron daemon is running.)

# ps -fu www-data
UID        PID  PPID  C STIME TTY          TIME CMD
www-data   920 23660  0 21:18 ?        00:00:01 /usr/sbin/apache2 -k start
www-data   929 23660  0 21:18 ?        00:00:01 /usr/sbin/apache2 -k start
...


# su -c "ps -fu www-data" zabbix
UID        PID  PPID  C STIME TTY          TIME CMD
#

User zabbix cannot see processes of other users.

I tried to disable (I do not know if it was enabled) hidepid. I put to fstab:

proc   /proc   proc   defaults,hidepid=2,gid=zabbix   0   0

proc   /proc   proc   defaults,hidepid=0   0   0

(First attempt "hidepid=2,gid=zabbix", second attempt "hidepid=0".)

And remount proc:

# mount -o remount,rw,hidepid=0 /proc
# mount | grep proc
proc on /proc type proc (rw,relatime,gid=123)

Nothing changed. User zabbix still cannot see processes of other users. It is only server that I have this problem.

At /var/log/zabbix/zabbix_agentd.log there are no related info.

Can you please help me what can be bad?