1) Which exact ISPConfig version do you use? - both lenny with ispconfig 188.8.131.52
2) Any errors in the monitor of the ispconfig log? - No errors
3) How did you add the second server to the first server? - On 2nd server i did expert install, gave root permission on server 1 and loaded the db of masterserver, all succesfull, no errors. configured networking on master serv with the ip from master and secondary server.
and just now i got this error in putty after a restart of apache2:
Restarting web server: apache2^[[BSyntax error on line 7 of /etc/apache2/sites-enabled/1.of.thedomains.nl.vhost:
The address or port is invalid