...if you see no other way to troubleshoot this (I don't want to have you going and testing this in x86), could you then help me through moving this really old installation (ispconfig2 that was updated to ispconfig3) to a perfect server setup in a x64 environment?
We no longer need the ISP part of this server and would love to migrate to a simple, mysql-driven, single-domain installation keeping all users, passwords and stored mail too. Is there a guide available for this?
I was thinking to go with
Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Ubuntu 11.10)