Sync to Exchange 2003 error

[gsc2000]

I need some help with my tilt not syncing with company exchange 2003 server OVER THE AIR on 3G. I can sync with my PC via USB, and I can sync with the exchange 2003 server while connected to the company wifi, but I cannot sync with the exchange server while connected to wifi at home. When I try to sync it just says "Waiting on Network", with support code 0x80072EFD. "The server could not be connected". This all started the weekend of March 5, around daylight savings time, a long time to be without the ability to sync. I am only syncing email and contacts, no calendar or tasks and such. I use IE or Skyfire to connect to the internet, both of which work fine.
I have searched xda and tried everything that even looked similiar to my problem with no success.

I have a ATT Tilt and using the HTC ROM:
Windows Mobile 6.1 Professional
ROM version 3.57.502.2 WWE
ROM date 07/17/08
Radio version 1.65.21.18
Protocol version 25.88.40.05H

Thanks for any help or ideas.