Starting this past Friday (12/12/08) the Method Integration Engine started logging errors:
Error: The remote server returned an error: (407) Proxy Authentication Required.
There was a firewall change on ISA 2004 in the form of a Web Publishing Rule for OMA. That rule has since been removed, and no longer needed, but this error still exists. Is there a specific port or rule that needs to be created for the Method engine to go out? Everything else is working on the network (i.e. Web, VPN, RDP, OWA, FTP).
Any insight would be greatly apprciated.