Cannot conntect to ActiveSync 4.1 / WM 5



I've read the groups, and i've tried the MS tech info but still cannot
connect to AS4.1.
I've tried installing the 4.2 beta, tried, downgrading to 3.7 & 3.8,
but still no joy.
I've tried changing Windows firewall settings, disabling the firewall,
but still nothing.

Can someone please HELP me.......

.