Telnet to port 25 via firewall problem

[scott]

I have a LAN divided into 2 subnets with a firewall in between. I have
forwarded port 25 from one subnet (external) to the other (internal). I know
this is setup correctly as I have other ports open that work. I know the
exchange server is ok as I can telnet to it on the internal LAN.

When using telnet on port 25 from subnet (external) to the other subnet
(internal) I get "connection failed".

Must I have anything else open to allow this connection to occur ? i.e
telnet port on 22 for example or does the fact that I use 25 negate this ?

Thanks for your time.
Scott.

 

[Michael Platts [MSFT]]

Hi Scott,

You shouldn't need to open any other ports for this to work. The issue
must be with the forwarding configuration somehow. Does the firewall give
any diagnostic information (such as logs) that could be helpful to you?

Best regards,
Michael Platts, MCSE
Microsoft Product Support

NOTE: Please reply to the newsgroup and not directly to me. This allows
others to add to and benefit from these threads and also helps to ensure a
more timely response. Thank you!
This posting is provided "AS IS" without warranty either expressed or
implied, including, but not limited to, the implied warranties of
merchantability or fitness for a particular purpose.

 

[scott]

Hi,

Thanks for the response. Firewall logs helped diagnosis. It was a NAT
problem on various routers.

Thanks for your time.
Scott.