I'm a little unclear on your topology. Please elucidate. Are you trying to connect to the front-end server from inside your firewall or outside your firewall? If your FE and BE servers are not segmented or filtered, you do not need to map the ports. Are you attempting to use RPC/HTTP? Or a direct MAPI connection? -----Original Message----- From: Frédéric Giroux [mailto:fgiroux@xxxxxxxxxx] Sent: Saturday, February 25, 2006 7:41 PM To: [ExchangeList] Subject: [exchangelist] Outlook connection with MAPI to front-end server http://www.MSExchange.org/ Hi! I am having a problem connecting with Outlook (MAPI) to front-end servers. It can not resolve the username. There is no firewall between the front-end and back-end servers (the front-end servers are used for load balancing). I can connect to the front-end servers using POP or OWA no problem. Just does not work with MAPI. I have not done any registry changes regarding ports since there is no firewall. Maybe I am in error and I must configure the registry to map the ports? The back-end server IS NOT a DC. Any insight would be very appreciated :-) Fred _____________________________________ Frederic Giroux, technical director Niveau3 Inc. IT consultants fgiroux@xxxxxxxxxx www.niveau3.ca 514-352-4782 (ext. 223) 514-352-9126 (fax) 866-477-4782 (toll free) ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: michael@xxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to info@xxxxxxxxxxxxxx