Timsieved daemon IMAP logon problem

Hi! I'm trying to install Avelsieve 1.0.1 in conjunction with SquirrelMail 1.4.5 on a newish OS X Server box running 10.4.8. Followed the directions, including adding [code]sieve 2000/tcp #Sieve mail filtering[/code] to /etc/services/. Also followed the Avelsieve instructions, as well as SquirrelMail's plugin activation routine. Am now getting a link in SquirrelMail to Filters, but I get the dread "Could not log on to timsieved daemon on your IMAP server localhost. Please contact your administrator." I've reviewed what's been posted here at AFP before on this topic; I'm just wondering if anybody has yet come up with a [b]definitive[/b] fix. The older posts involve so many suggested workarounds, it's difficult for me to sort out what will work from what might help me really mess things up a lot, as I'm a command-line neophyte. I haven't done much to the default install of X Server, so I'm disappointed adding Vacation Reply functionality to web mail has turned into such a bear. One thing that strikes me is Port 2000 in /etc/services/ seems to already be designated for some other service ("callbook"). Could that be part of the problem?