Port 25?

17 Jun 2009 7:19 AM

André_van_der_Hoeven

I setup a new Exchange 2007 server (Windows 2008). I'm still testing.
When I use telnet (telnet private-IP-address 25) from our network the mail
server acts fine.
When I use the same telnet from another place using the public ip address
(telnet public-IP-address 25) then there is no reaction from the server. I
opened port 25 on our router (NAT & firewall)
What else do I have to do?

17 Jun 2009 4:22 PM

John Oliver, Jr. [MVP]

What type of firewall? Can you see in logging file on your firewall that
its actually passing through successfully?

--
John Oliver, Jr
MCSE, MCT, CCNA
Exchange MVP 2009
Microsoft Certified Partner

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"André van der Hoeven" <andre***@hetnet.nl> wrote in message
news:3645B6C9-31E6-497A-A2D4-5A4B25009294@microsoft.com...
> I setup a new Exchange 2007 server (Windows 2008). I'm still testing.
> When I use telnet (telnet private-IP-address 25) from our network the mail
> server acts fine.
> When I use the same telnet from another place using the public ip address
> (telnet public-IP-address 25) then there is no reaction from the server. I
> opened port 25 on our router (NAT & firewall)
> What else do I have to do?
>

17 Jun 2009 4:27 PM

Martin Blackstone [MVP]

Also the "other place" you are testing from may actually be blocking port
25. For example if you are doing this testing from your home machine.

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"John Oliver, Jr. [MVP]" <jcolive***@hotmail.com> wrote in message
news:E8E58DAC-9D04-4E49-81E6-5FE7B2322319@microsoft.com...
> What type of firewall? Can you see in logging file on your firewall that
> its actually passing through successfully?
>
> --
> John Oliver, Jr
> MCSE, MCT, CCNA
> Exchange MVP 2009
> Microsoft Certified Partner
>
>
> "André van der Hoeven" <andre***@hetnet.nl> wrote in message
> news:3645B6C9-31E6-497A-A2D4-5A4B25009294@microsoft.com...
>> I setup a new Exchange 2007 server (Windows 2008). I'm still testing.
>> When I use telnet (telnet private-IP-address 25) from our network the
>> mail server acts fine.
>> When I use the same telnet from another place using the public ip address
>> (telnet public-IP-address 25) then there is no reaction from the server.
>> I opened port 25 on our router (NAT & firewall)
>> What else do I have to do?
>>

17 Jun 2009 11:10 PM

Kevin W Miller

André van der Hoeven wrote:

> I setup a new Exchange 2007 server (Windows 2008). I'm still testing.
> When I use telnet (telnet private-IP-address 25) from our network the
> mail server acts fine.
> When I use the same telnet from another place using the public ip
> address (telnet public-IP-address 25) then there is no reaction from
> the server. I opened port 25 on our router (NAT & firewall)
> What else do I have to do?

You may need to set up a NAT policy telling the firewall how to handle
traffic on Port 25.

Kevin W. Miller

18 Jun 2009 10:43 AM

Lee Derbyshire [MVP]

"André van der Hoeven" <andre***@hetnet.nl> wrote in message
news:3645B6C9-31E6-497A-A2D4-5A4B25009294@microsoft.com...
>I setup a new Exchange 2007 server (Windows 2008). I'm still testing.
> When I use telnet (telnet private-IP-address 25) from our network the mail
> server acts fine.
> When I use the same telnet from another place using the public ip address
> (telnet public-IP-address 25) then there is no reaction from the server. I
> opened port 25 on our router (NAT & firewall)
> What else do I have to do?

Many AV packages will block direct outgoing port 25 connections. Check the
settings.

Lee.

--
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