Fw: (RADIATOR) Telnet, SMTP and port 25

[Ayotunde Itayemi]

----- Original Message ----- 
From: Ayotunde Itayemi 
To: Hugh Irvine 
Sent: Wednesday, August 21, 2002 6:23 PM
Subject: Re: (RADIATOR) Telnet, SMTP and port 25


Hi Hugh,

Traceroute gets to the destination.
Pings are replied (reaches destination).
Also telnet to myself (mail server) on port 25 (from the same box)
works i.e,     telnet 127.0.0.1 25
This also works:            telnet mail 25

BUT this does not:    telnet any-internet-mailserver 25

Regards,
Tunde I.

  ----- Original Message ----- 
  From: Hugh Irvine 
  To: Ayotunde Itayemi 
  Cc: radiator at open.com.au 
  Sent: Wednesday, August 21, 2002 5:37 PM
  Subject: Re: (RADIATOR) Telnet, SMTP and port 25


  Hello Tunde -

  The error message clearly states "No route to host".

  Try a traceroute to see what is amiss.

  regards

  Hugh


  On Wednesday, August 21, 2002, at 06:12 PM, Ayotunde Itayemi wrote:


    Hi Hugh, Hi all,
     
    Okay this is not a RADIUS question, but excuse me anyway.
     
    I have a RedHat 6.2 Linux system that has been configured as a mail server
    for a real Internet domain. Users can receive their mails but nothing (mails) can be sent out.
     
    After a lot of troubleshooting I made out the following:
     
    1. The system can't send mails out because you cannot initiate a telnet session from it
        to any other system on port 25 e.g.,
     
    [root at mail itayemi]# telnet 10.0.4.4 25
    Trying 10.0.4.4...
    telnet: Unable to connect to remote host: No route to host
     
    This is the same message that keeps being written to the mail log (/var/log/maillog)
    by sendmail. Any ideas?
     
    You can telnet to it on port 25 from other systems.
     
    I have looked at all the common causes I can think of (DNS, inetd, routing, sendmail etc)
    Nothing seems to work. The system is not configured as a firewall and the port is not blocked
    by the router or any other device.
     
    Regards,
    Tunde I.
     
     



  NB: I am travelling this week, so there may be delays in our correspondence.

  -- 
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  anywhere. Available on *NIX, *BSD, Windows 95/98/2000, NT, MacOS X.
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