Re: Can't telnet port 25 from server but can from other client

From: Les Connor [SBS Community Member] (les.connor_at_DEL.cfive.ca)
Date: 12/16/04 

Date: Thu, 16 Dec 2004 16:42:54 -0600

Using ISA ?

You need a packet filter for the SBS. Client computers don't need it,
because they've got the proxy client.

Running CEICW will correct that, creating a packet filter for SMTP.

If no ISA, then what A/V product are you using. What happens if you turn it
off ? I think there might be an issue with Scanmail and the pop3connector,
where there's a hotfix to correct it. 

-- 
Les Connor [SBS Community Member]
-----------------------------------------------------------
SBS Rocks !
"Julie Turner" <JulieTurner@discussions.microsoft.com> wrote in message 
news:6F5B7E81-8BB2-4FC7-8437-66363F892CCE@microsoft.com...
> All outgoing email is blocked.  Neither smarthost or DNS work (i've tried
> both) but currently the configuration is using smarthost.  I've tried 3
> different smarthost servers.  To eliminate DNS from the equation I'm using
> the IP address of the smarthost and have verified they are responding to 
> ping
> tests before trying them.  I think if you boil the problem down a little
> deeper the problem is that I can't telnet on port 25 from the server to 
> any
> SMTP server even one in the same network.  If I turn SMTP services on on a
> client machine in the network I can't get to it etiher.  But that client
> machine can telnet outside the network to a smtp server on port 25 which
> means my ISP isn't blocking port 25.  It really seems like there is some 
> sort
> of firewall or something that's blocking port 25 traffic out of the 
> server,
> but I didn't turn the firewall on and there doesn't seem to be any way to
> tell if it's running "accidentily".
>
> "Michael Patrick" wrote:
>
>> Okay, restarted.....still nada....
>> Is it all outgoing e-mail that is getting stuck?  Or just to a particular
>> domain?
>> And you didnt say if you are using a smarthost or dns to route e-mail...
>>
>> "Julie Turner" wrote:
>>
>> > Unfortunately starting and stopping the service did not do anything, 
>> > although
>> > I was fairly sure it wouldn't becuase I've restarted the server several 
>> > times
>> > today, and ran the internet and email connection wizard about 6 
>> > different
>> > times, hoping that something just want's "taking".
>> >
>> > As I said in my other email I know the ISP isn't blocking traffic on 
>> > port 25
>> > for two reasons.  The first, I called them and they said they don't. 
>> > And the
>> > second, becuase if I go to another machine on the local network and try
>> > telnet smtp.mainesource.com 25 it connects.  If I try to do the same 
>> > thing
>> > from the server, it fails to connect, however, I can't ping
>> > smtp.mainesource.com and it responds so I'm fairly sure there is no DNS
>> > problem.
>> >
>> > The real pain here is that it was working at one point and isn't now 
>> > for no
>> > apparent reason.  There is a router and a DSL modem and they both have
>> > firewalls however, it's my understanding that firewalls such as these 
>> > only
>> > block incomming traffic so I am not sure why I would want to open up 
>> > port 25
>> > unless I'm just missing something there.
>> >
>> > "Michael Patrick" wrote:
>> >
>> > > Just for the heck of it......go to System Manager (exchange), under 
>> > > admin
>> > > groups, first admin, server, protocols, and then SMTP you have your 
>> > > virtual
>> > > server..... try to stop and restart.....
>> > >
>> > > If that doesnt work, we may want to check your settings there......or 
>> > > do you
>> > > have a router that might not be configured properly?
>> > >
>> > > Since you said it was working fine, and if restarting the SMTP server 
>> > > does
>> > > not help....call your isp and see if they changed anything 
>> > > recently....they
>> > > may have blocked your port 25 there..... Which this may be the 
>> > > case....
>> > >
>> > > Go to your SMTP Virtual server properties, delivery tab and advanced 
>> > > button
>> > > what is listed in smarthost?
>> > >
>> > > "Michael Patrick" wrote:
>> > >
>> > > > Running ISA at all?
>> > > >
>> > > > "Julie Turner" wrote:
>> > > >
>> > > > > Hopefully someone has some ideas...
>> > > > >
>> > > > > For about 3 weeks email has been happily coming in on the pop3 
>> > > > > connector and
>> > > > > going out via forwarding to a smart host.  Somehow something got 
>> > > > > changed and
>> > > > > all the sudden email is stuck in the SmallBusiness SMTP connector 
>> > > > > queue.  I
>> > > > > cannot telnet to an external smtp server on port 25 from the 
>> > > > > SBS2003 server.
>> > > > > However, I can do so from another computer on the internal 
>> > > > > network which
>> > > > > disproves my original assumption that the ISP was blocking port 
>> > > > > 25.
>> > > > >
>> > > > > The Firewall on the server is turned off... or is the the best of 
>> > > > > my ability
>> > > > > to ascertain.  However, it's been suggested to me that the server 
>> > > > > is blocking
>> > > > > outgoing traffic on that port.  I've checked the TCP/IP filtering 
>> > > > > on the
>> > > > > network connection and none are set up...
>> > > > >
>> > > > > So at this point i'm at a loss.  Anyone have any ideas?