Originally Posted by treolover thanks, checked the connection and it was checked already. How about the BT modem and internal modem connections, do they need to be enabled?...didn't seem so, but what do i know. Tried to sync again...still no connection. So, I've tried every suggestion so far and no go. I must say that BT sync has worked for me in the past. I think the problem started when I started using iSync to sync with Mac Address Book and iCal.
Still lovin' my Treo/Mac combo, nice to have addresses and calendar (previously separate in cellphone, palmpilot and computer) all synched in one place. And, never fear, my cable sync still works, so

and

for me, but ain't that like life itself.
I am having nearly the same set of symptoms as you! An intermittent start - I was syncing fine using BT and Mac 10.4.3 for several months. I can't remember; all of my problems may have started when I upgraded to 10.4.4 but I am not sure. Anyway I could not sync one night, and so I fiddle around a bit and got it to work. A couple more off/on success/failures... and now I cannot sync at all (except with the cable). I tried a hard reset and even upgrading the software to 1.04-VZW. I use other BT functions on the phone and so I know it is working. I get the same error message "port in use..." whether the computer is on or not. Sigh. Someone??