which index.html is correct ?
 

Have with ispconfig created 2 sites, say sateA and siteB.
Going to /var/www I find there: (ih=index.html)
-ih; It works !
-siteA/ih: It works site A
/web1/ih: It works ! for siteA
/web/ih: Welcome in siteA
-siteB/web/ih: Welcome is siteB
-clients/client0/web1/web/ih: Welcome in siteA
/web2/web/ih: Welcome in siteB

IMHO that is too much/often. Did I something wrong ? What/where ?

Thats all fine and as it should be. If you have sitea.tld and siteb.tld, then the index files are:

/var/www/sitea.tld/index.html

and for site b:

/var/www/siteb.tld/index.html

Thank you Till.
That was my idea too.
So, all after /var/www/clients can be deleted.
Thanks again n bey bey

No, dont do that! The files are the same, they are symlinks. If you delete them, then you remove your websites.

Thanks again !!