In the mean time I got it back working. So I can log in to the FTP users again. It turned out there was a file which containes the min ftp user id which was 1000 but my id's in dbispconfig start at 1.
However, now I'm able to log in but the ftp users have access to all folders. Also, some FTP programs start in root of server some in the dir that is set in the ftp_users table in ispconfig.
The query to get the dir is OK (checked mysql log) and all parent folder of that dir are "root" / "root" (owner, group) so ftp user shouldn't have access to it.
So, either users are given root permissions or my folders aren't protected. Since I didn't change anything to the last one, I suspect the first one.
Last edited by wouteronline55; 26th October 2013 at 16:23.