After update: Web interface not reachable

[juergen@]

Hi,

after I run an update of Plesk, I couldn't reach the web interface. Since I thought all services are running, I rebooted the server. during the reboot I saw this:

Key file not found!
Plesk authorization failed: HTTP request error [7]
Error: Plesk Software not running.

I tried /etc/init.d/psa start but I got the same error.

I ran 'sh ./my-plesk-key.sh' and rebooted again as the script finished.

No success at all.
Can anyone help for me?

Juergen