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Old 08-11-2005, 01:01 PM   #1
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Question telenet to a linuxbox not working from a windows pc but from Solaris

I have one Linux box (=SERVER) running Fedora Core 3 with an installed and working sendmail on it. The SERVER is directly connected to the Internet via leased line. For security reasons I am using IPTables on that SERVER.

The SERVER is able to send an receive e-mail.

To be able to send mails from a client (=CLIENT) at home (A Windows 2003 Server) via that Linux box, I have installed SMTP-Auth on the SERVER to avoid to have an open relay.

I am able to use the SERVER as an SMTP server via Outlook with authentication activated on my CLIENT.

I am running a Lotus Notes Server on the CLIENT, but SMTP Auth. functionality is not implemented into Lotus Notes. So I installed MercuryC SMTP Client on the CLIENT.
But I am not able to connect to the SERVER using the SMTP Auth user/password.

Then I tried to telent the SERVER from my CLIENT. On the Windows Server 2003 CLIENT I have entered

>telnet 25

But all i got was: "Connection Refused". Doing that local on my SERVER is no problem, there I can connect to SMTP Port 25 and do a HELO or EHLO.

I tried to telent my SERVER from different clients (Windows XP and Windows 2003 Server), and I found out that a telnet from a Sun Solaris is working and takes me to SMTP Login...

So, experts,

Q1) Why is telnet working from a Sun Solaris box and NOT from Windows

Q2) What can I do to get Mercury talking to my Server

Any help would be appreciated!
Old 08-12-2005, 06:02 AM   #2
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Stop your server firewall(iptables) and check , telnet service is running or not.
Old 08-12-2005, 06:35 AM   #3
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Telnet to another port e.g. 22 for SSH is working!
Old 08-12-2005, 10:19 AM   #4
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Ok, telnet to port 25 is now working. If you have same problems and installed McAfee Virusscan Enterprise 8, take a look into your anti-virus configuration. There is an option to block SMTP traffic on port 25.

Once I have deactivated that, I was able to telnet the SERVER.

Not bad so far, but I am still not able to to use my SERVER as a relay host with mercury running on my CLIENT.

I get the following errors:

within mercury: Connection error during handshake with SERVER
in the maillog on the SERVER:
SERVER sendmail[8038]: j7CFFWoJ008038: [xx.21xx1.215] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

Any idea?


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