UDP and TCP port 53 is used by DNS. Mark Fugatt MCT, MCSE, Microsoft Exchange MVP Pentech Office Solutions Inc Tel: 585 586 3890 Cell: 585 576 4750 Fax: 585 249 0316 www.4mcts.com www.exchangetrainer.com -----Original Message----- From: David Liles [mailto:dave@xxxxxxxxxxxxxxxxxxx] Sent: Wednesday, July 02, 2003 6:08 PM To: [ExchangeList] http://www.MSExchange.org/ what are the ports needed for DNS name resolution? I'm having a problem with IP Filtering configuration.... -----Original Message----- From: Mark Fugatt [mailto:mark@xxxxxxxxx] Sent: Wednesday, July 02, 2003 5:03 PM To: [ExchangeList] Subject: [exchangelist] RE: Exchange 2000 and firewalls, I need some Help!! http://www.MSExchange.org/ The only port that you would need to have open for your Exchange server to send and receive mail via the Internet would be port 25 (SMTP), you would also need to make sure you have the ports needed to perform DNS name resolution for outgoing mail. Here is an article about hosting your own SMTP mail: http://www.msexchange.org/tutorials/MF002.html Mark Fugatt MCT, MCSE, Microsoft Exchange MVP Pentech Office Solutions Inc Tel: 585 586 3890 Cell: 585 576 4750 Fax: 585 249 0316 www.4mcts.com www.exchangetrainer.com -----Original Message----- From: Erhard Haniffa [mailto:erhardhaniffa@xxxxxxxxxxxxxxxxx] Sent: Wednesday, July 02, 2003 5:46 PM To: [ExchangeList] http://www.MSExchange.org/ Hi everyone, I've read the following article on MS Knowledge base : 280132 that describes how to make connections to an MS Exchange 2000 server sitting on a DMZ. What I'm actually looking for is what ports do I need to open up on my firewall so my exchange 2k server can send and receive mail through the internet? Thank you in advance Ed ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: mark@xxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub') ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: dave@xxxxxxxxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub') ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: mark@xxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')