Thanks for putting this step. I installed ispconfig on a local machine and i skipped this step. however, the local machine worked fine(including FTP). Then i re-image exactly the same, but with different ip (was hosting by a colo datacenter). when i installed it at the colo, everything worked fine, except for the FTP. Then i remembered i skipped this step. I just returned to this page and did the step above. BINGO!!, it worked. You're a genius. Thanks for a great tool. Hope someday i'll make it big so i can help to contribute to this project.