I run from the root
chown web4:client2 /var/www/clients/client2/web4/web
1. I can successfully access to the website through www.salx.mywebsite.com
2. I can access successfully to the folder website
if I access via ssh to the folder website I reach the following path
I can reach also the root path /
About your last question
'Which ISPConfig version do you use?'