Can't start or see ISPConfig

Hi,

since I had to restart my server this morning after it had crashed, I cannot see my ISPConfig. There is no error message, only a blank page. I have entered the usual URL consisting of

Code:

IP-address:port

The server tries for a while and then gives up. I just checked with Opera, there I get a 500 error. Any ideas?

 

Code:

systemctl --state=failed
free -h
df -hT

Then look what is in log files.

 

Good, that worked. There were in fact four services not running, which I started and now I can access ISPConfig again. About free space, there is about 50% free both in RAM and on disk.
Thanks!