ISPConfig 3.0.5 RC 1
I knew I had to look there but since it happened right after upgrading I thought it was related so maybe worth raising here.
There were some errors in the affected website's error log about not being able to read .htaccess.
I had some other websites ok at the time so checked their .htaccess permissions.
Noticed the working websites had .htaccess permissions of 754 so applied it to the affected website .htaccess and it worked.
Btw, the .htaccess had gotten 710 permissions somehow.
Hope it helps someone.
Last edited by dragosl; 29th January 2013 at 20:06.