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: 12/17/04 

Date: Fri, 17 Dec 2004 12:10:33 -0600

the CEICW is attempting to correct your mistakes. If it's failing somewhere,
post the error message or find the ICW.log and post the failures from it.

also, have a look at http://www.smallbizserver.net in the networking
section. 

-- 
Les Connor [SBS Community Member]
-----------------------------------------------------------
SBS Rocks !
"Julie Turner" <JulieTurner@discussions.microsoft.com> wrote in message 
news:CD9B19EB-E9D5-4BF9-96F1-8EF19E44CAA8@microsoft.com...
> First, thank you all for your ideas... here's what I found from your
> suggestions
>
> Ok. CEICW tells me that it's not configuring the firewall becuase I only
> have one NIC.  So that's why I don't think the firewall is turned on.  The
> network configuration in the CEICW has always failed from day one, but the
> email was working then so I have always just fixed the settings in the
> network configuration myself.  Otherwise the other three complete fine. 
> What
> the CEICW doesn't set right is the DNS.... for some reason it set's it to 
> the
> server's IP address.. I just mod it to point to the modem (which is 
> pointed
> out to 2 ext. DNS servers that the ISP manages.)
>
> Anyway, here's the IPCONFIG /ALL
> Windows IP Configuration
>
>   Host Name . . . . . . . . . . . . : MS-SERVER
>   Primary Dns Suffix  . . . . . . . : MaineSource.local
>   Node Type . . . . . . . . . . . . : Unknown
>   IP Routing Enabled. . . . . . . . : Yes
>   WINS Proxy Enabled. . . . . . . . : Yes
>   DNS Suffix Search List. . . . . . : MaineSource.local
>
> Ethernet adapter Server Local Area Connection:
>
>   Connection-specific DNS Suffix  . :
>   Description . . . . . . . . . . . : Intel(R) PRO/1000 CT Network 
> Connection
>   Physical Address. . . . . . . . . : 00-C0-9F-47-33-83
>   DHCP Enabled. . . . . . . . . . . : No
>   IP Address. . . . . . . . . . . . : 10.0.0.4
>   Subnet Mask . . . . . . . . . . . : 255.0.0.0
>   Default Gateway . . . . . . . . . : 10.0.0.2
>   DNS Servers . . . . . . . . . . . : 10.0.0.2
>
> There is nothing in the modem (which is acting as the router) to indicate
> that it's blocking outgoing traffic... further, since another machine on 
> the
> internal network can telnet out to smtp.mainesource.com  on port 25 I feel 
> at
> this point I've narrowed the problem down to the server specifically.
> 10.0.0.9 is also running the SMTP service and the server at 10.0.0.4 
> cannot
> telnet to it either on port 25 but it can ping it.
>
> To be honest I'm not 100% sure what ISA is and how to turn it on... if it 
> is
> on I didn't turn it on intentionally and I can't find any programatic
> reference to it now to check anything.  What's confusing here is that if 
> that
> was the problem then it got turned on sometime in the last week becuase 
> this
> whole thing was working about 2 weeks ago.
>
> I currently do not have any A/V installed so that is not the problem... it
> was my next step but of course, since I haven't gotten the email running I
> haven't moved there yet.
>
> My incomming mail from the pop3 connector is coming in fine... I just 
> can't
> send email back out again through the SMTP connector.  But again, since I
> can't telnet out of the server on port 25 I'm not expecting it to either.
>
> I tried applying the hotfix... unfortunately that did nothing.  I have now
> also tried uninstalling and reinstalling the SMTP service.  That also did
> nothing.
>
> "Julie Turner" wrote:
>
>> 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?
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