OS X Server 10.4.11: Can no longer login to ftp

http://lists.apple.com/archives/macos-x-server/2006/Jun/msg00308.html has the answer. 

I spent some time chasing this one. I couldn't login anonymously or with a user login. AARG. 

Turns out, you shouldn't leave Server Admin running, as it can corrupt the ftpaccess and ftpaccess~

I'm also wondering if running the 10.4 admin tools on OS X 10.5 caused it. Running Server monitor 1.5f6 on OS X Client 10.5 crashes instantly. Both versions of Server Admin (the one on my server running OS X Server 10.4.11 and my laptop running 10.5.8) are the same though.

After deleting those files a couple times and restarting the ftp service, it works again. I also wiped the log file at /Library/Logs/FTP.transfer.log