I have an Exchange server which is not a Global Catalog Server. I have tested RPC through the firewall by going to http://server.domain.com/rpc and http://server.domain.com/rpc/rpcproxy.dll per Microsoft Article 833401. I have configured the Exchange server RPCPROXY Registry Key per http://www.amset.info/exchange/rpc-http-server.asp
following the section Dual Server Installation. Now when I open the outlook client and configure it I get prompted for authentication, I put in DomainName\UserName and my password, it then pops right backup and asks for it again and never connects to the server. What am I missing, my single server install works flawlessly!