Exchange, Outlook and DNS problem

  • Thread starter Thread starter Ivo Buljeta
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Ivo Buljeta

Hi all,

I have a specific question regarding setup made in my company and a problem
in it. Since I'm realtively new in this, I'll be as detailed as possible
and would appreciate as detailed answer as somebody is willing to give.

Company deceided to switch from ISP POP3 to local Exchange server. We
already had Win 2003 SBS (DC), but since we receive large ammounts of mail
with big attachments we went for new machine with Win 2003 and Exchange
2003 Enterprise. We also used old server with Win 2000 Server for ISA 2004
firewall to have RPC over HTTP functionality which is needed for our mobile
users for e-mail access. In front of all that is Cisco router which NATs
all trafic to internal network. To do a test run we registered dyndns.org
domain and gave it IP which Cisco routes to local ISA IP address.ISA is
configured to do RPC over HTTP routing for Exchange which is also located
in internal network. Problem occurs when we try to create new Exchange mail
account in Outlook while connected internal network. When I enter
dyndns.org domain name and username, Outlook always resolves it's name to
local one (company.dyndns.org to exchange.company.local). On our DC I've
created DNS zone for dyndns.org and name "company" which points to Exchange
server. When I try ping to dyndns.org address it goes to right machine and
everything, but Outlook always reverts to local name.

I there a way to fix this and if there is, how?

Thanks in advance,
Ivo
 
In
Ivo Buljeta said:
Hi all,

I have a specific question regarding setup made in my company and a
problem in it. Since I'm realtively new in this, I'll be as detailed
as possible and would appreciate as detailed answer as somebody is
willing to give.

Company deceided to switch from ISP POP3 to local Exchange server. We
already had Win 2003 SBS (DC), but since we receive large ammounts of
mail with big attachments we went for new machine with Win 2003 and
Exchange 2003 Enterprise. We also used old server with Win 2000
Server for ISA 2004 firewall to have RPC over HTTP functionality
which is needed for our mobile users for e-mail access. In front of
all that is Cisco router which NATs all trafic to internal network.
To do a test run we registered dyndns.org domain and gave it IP which
Cisco routes to local ISA IP address.ISA is configured to do RPC over
HTTP routing for Exchange which is also located in internal network.
Problem occurs when we try to create new Exchange mail account in
Outlook while connected internal network. When I enter dyndns.org
domain name and username, Outlook always resolves it's name to local
one (company.dyndns.org to exchange.company.local). On our DC I've
created DNS zone for dyndns.org and name "company" which points to
Exchange server. When I try ping to dyndns.org address it goes to
right machine and everything, but Outlook always reverts to local
name.

I there a way to fix this and if there is, how?
Click to expand...

Not sure if this is the problem you're having but it sounds like it.
You may need to force Outlook to use RPC over HTTP and not fallback to TCP.

Forcing Outlook 2003 to use RPC over HTTP:
http://support.microsoft.com/default.aspx?scid=kb;en-us;555233

If this is not your problem please verify you have made the registry changes
needed for RPC over HTTP to work.
How to configure RPC over HTTP on a single server in Exchange Server 2003:
http://support.microsoft.com/default.aspx?scid=kb;en-us;833401
 
Not sure if this is the problem you're having but it sounds like it.
You may need to force Outlook to use RPC over HTTP and not fallback to TCP.

Forcing Outlook 2003 to use RPC over HTTP:
http://support.microsoft.com/default.aspx?scid=kb;en-us;555233

If this is not your problem please verify you have made the registry changes
needed for RPC over HTTP to work.
How to configure RPC over HTTP on a single server in Exchange Server 2003:
http://support.microsoft.com/default.aspx?scid=kb;en-us;833401
Click to expand...

Thanks for quick responese :)

I did all the necessary registry edits for Exchange server, but wasn't
aware of Outlook fix.

Thanks again,
Ivo
 
In
Ivo Buljeta said:
Thanks for quick responese :)

I did all the necessary registry edits for Exchange server, but wasn't
aware of Outlook fix.

Thanks again,
Ivo
Click to expand...

Also, you may want to take a look at this if it applies:

How to configure an RPC over HTTP topology on computers that are running
Exchange 2003 with Service Pack 1:
http://support.microsoft.com/default.aspx?scid=kb;en-us;841652


--
Regards,
Ace

Please direct all replies ONLY to the Microsoft public newsgroups
so all can benefit.

This posting is provided "AS-IS" with no warranties or guarantees
and confers no rights.

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft Windows MVP - Windows Server - Directory Services
Infinite Diversities in Infinite Combinations.
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