Remote VPN users can't connect to corporate Exchange server through Outlook

pythagoras · 06-24-2009, 10:20 AM

Running Exchange 2007Enteprise at the office. All users on the LAN can connect, all external users can connect to OWA no problem, and all VPN users can also connect to network shares and OWA but can NOT connect to Exchange through Outlook (2003 and 2007 versions). They can't ping the internal mail server when VPN'd in. Here's my setup in terms of Exchange:

Exchange 2007 Enterprise on LAN (server name=mailserver.mydomain.com) - 10.0.1.2
Sonicwall Pro2040 firewall/vpn with one-to-one NAT rule for 10.0.1.2 NAT'd to public IP 66.66.66.11 (changed for this example)
MX record set on external DNS server points to 66.66.66.11 - mail.mydomain.com
The DNS doesn't seem to be the problem, as we can get to OWA and whatnoe just fine....

They can connect to all other drives and sales tools BUT Exchange server “ Outlook 2007”

Additional note:

My exchange server has two network cards: only one network card is used to conect to LAN network. I dicoverd that If I plug another cable in second network card, VPN users can connect but my outgoing emails stop going out and I end up with 100’s of emails wainting to go out to external servers.

Have try to amend the local host file - not doing any good
have try to enable NETBIos over TCP/IP - not doing any good

Many thanks in advanced ....

L8ians · 07-07-2009, 07:22 PM

Check whether deny rules for the Exchange TCP connections in your firewall settings

Also check for the exchange server name in the mail profile.

06-24-2009, 10:20 AM	#1 (permalink)
pythagoras Registered User Join Date: Jun 2009 Posts: 1 OS: win server 2003	Remote VPN users can't connect to corporate Exchange server through Outlook Running Exchange 2007Enteprise at the office. All users on the LAN can connect, all external users can connect to OWA no problem, and all VPN users can also connect to network shares and OWA but can NOT connect to Exchange through Outlook (2003 and 2007 versions). They can't ping the internal mail server when VPN'd in. Here's my setup in terms of Exchange: Exchange 2007 Enterprise on LAN (server name=mailserver.mydomain.com) - 10.0.1.2 Sonicwall Pro2040 firewall/vpn with one-to-one NAT rule for 10.0.1.2 NAT'd to public IP 66.66.66.11 (changed for this example) MX record set on external DNS server points to 66.66.66.11 - mail.mydomain.com The DNS doesn't seem to be the problem, as we can get to OWA and whatnoe just fine.... They can connect to all other drives and sales tools BUT Exchange server “ Outlook 2007” Additional note: My exchange server has two network cards: only one network card is used to conect to LAN network. I dicoverd that If I plug another cable in second network card, VPN users can connect but my outgoing emails stop going out and I end up with 100’s of emails wainting to go out to external servers. Have try to amend the local host file - not doing any good have try to enable NETBIos over TCP/IP - not doing any good Many thanks in advanced .... Last edited by pythagoras; 06-24-2009 at 10:21 AM.

07-07-2009, 07:22 PM	#2 (permalink)
L8ians Registered User Join Date: Sep 2008 Location: INDIA Posts: 100 OS: 2008/2003 Server/xp sp2/Vista/Windows Seven	Re: Remote VPN users can't connect to corporate Exchange server through Outlook Check whether deny rules for the Exchange TCP connections in your firewall settings Also check for the exchange server name in the mail profile.