Can't connect to web interface...

[rockandroller]

This is a CENTOS 7 installation, which has been running fine with four cameras active for the last two or three years.

Everything was working fine last I looked ( a month or two ago) - but today cannot connect to the web console
This site can’t be reached
zmdr.v.local refused to connect.

SSH in and it looks like all the usual ZM stuff is running OK:

zm-running.png (29.6 KiB) Viewed 1368 times

I checked zmupdate.pl - got this response

Database already at version 1.32.3, update skipped.

Having a closer look at the HTOP output, it seems there is some sort of abrt-watch-log bug message (not sure if relevant...)
BUG WARNING possible recursive, etc...

zm-running-closer-look.png (108.22 KiB) Viewed 1368 times

Can anyone advise how to troubleshoot this better? TIA!

[snake]

Zoneminder is viewed on the browser via apache. Is apache running? (I think its called httpd in centos)

This is obvious, but if something suddenly breaks, and you didn't change anything, it might be a filesystem running out of space. Post the output of
df -h
and what is in syslog/messages

you could also post the output of
ps aux
And look to see if httpd/apache is there.