Originally Posted by DanHorniblow
I then started getting a 403 error, which I fixed with the command "chown -R www-data /usr/local/ispconfig/interface/"
Thats most likely part of the reason for the http error as ispconfig runs under the user ispconfig and not www-data.
To fix the errors,download the ispconfig tar.z again, unpack it and run the update.php script which is inside
the install folder.