We recently signed up to a 3rd party hoster for filtering spam emails. It required blocking at the ISA firewall and only allowing port 25 in and outbound, also with setting relays to their subnetts for mail in exchange.
After that our certificates don't seem to work on PDA devices. I don't know anything other than how to find the certificate on the Exchange server, and install it onto devices. Why would this problem be happening? On a HTC Touch Dual, running Windows 6.0, the error code: 0x80072F17 comes up when trying to sync mail over the air.
Windows Server 2003, Exchange Server 2003 and ISA 2004. Thank you.