Hi, I am trying to setup RPC over HTTP. My FE server is in DMZ and BE server in internal network. I have followed the procedure in Microsoft RPC over HTTP deployment guide. I am facing problem while configuring mail profile. I am using Exchange 2003 With SP1 on Windows 2003 server. From PC located in internal net work I tried to configure the profile. When I try to do ?check name? it keeps asking for username and password and nothing happens Tried to configure profile on PC in DMZ and it doesn?t resolve my account name and it doesn?t even prompt for user name and password OWA access through FE is working fine and MAPI access to BE is also fine. Additionally I have allowed ports 6001, 6002 & 6004 from FE to BE. In fact I can see traffic on these ports from FE to BE on firewall log (Firewall Rules is applied on internal IP of FE and BE). In understand that I should have RPC 135 open from the client PC to FE server for me to configure the profile. I am trying to give the FE?s FQDN as server name which resolves to my FE public IP. I am following the document in exchange.org to configure the client. Should I allow RPC 135 to my FE external IP from my PC in internal network?? What is that I am missing ?? Please help. Regards Praveen R --------------------------------- Yahoo! Sports Rekindle the Rivalries. Sign up for Fantasy Football