Re: SMTP Port 25 blocked

Hi,

This what I have found out and done.

The ISP assures me that they have not blocked port 25 although this is a
home account.

Internal mail flows ok.

Telnet port 25 does not work.

Router is configured to forward port 25 to correct ip address.

Is there a chance that a third party has blocked port 25 on their fixed ip
address or the previous it people may have blocked this port internally in
the server.

I know this may be a long shot, but I am getting desperate.

Regards,

Guido


"Leythos" wrote:

In article <4A925ED7-D486-4D4F-B655-226DD4EA8059@xxxxxxxxxxxxx>,
Guido@xxxxxxxxxxxxxxxxxxxxxxxxx says...
When we telnet into port 25 it comes back with a message that it could not
open this port.

We are using a new modem/router and other services like remote desktop work
fine.

The first line is the key, the rest means nothing.

If you can not telnet to port 25 then you need to figure out why:

1) From outside your network, telnet to the public IP that is forwarded
to your servers NIC with SMTP bound to it - did it respond?

2) If the above fails, do it from inside your network, on the LAN, test
- does it respond?

3) Assuming #1 fails, #2 works, then you only have two other areas:

3A) is the new Modem (ISP device) giving you a PUBLIC IP or a PRIVATE
IP?

3AA) If the ISP device gives a private IP then you will need to get them
to provide a PUBLIC IP in what is called BRIDGE MODE if DSL, or just a
Fixed IP if it's a Coax Cable service or T1 type service.

3AB) If the ISP device gives a PUBLIC IP, then you need to make sure
that your ROUTER (NAT device/Firewall) is setup to FORWARD from External
IP to NAT IP of server in LAN that handles SMTP.

4) If you've fixed 3A/aa/ab, and it still doesn't connect you could
always call your ISP and ask if they are blocking SMTP Inbound ( in
fact, this would be the first call i would make).

--

Leythos
- Igitur qui desiderat pacem, praeparet bellum.
- Calling an illegal alien an "undocumented worker" is like calling a
drug dealer an "unlicensed pharmacist"
spam999free@xxxxxxxxxx (remove 999 for proper email address)

.

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