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-   -   telenet to a linuxbox not working from a windows pc but from Solaris (https://www.linuxquestions.org/questions/linux-newbie-8/telenet-to-a-linuxbox-not-working-from-a-windows-pc-but-from-solaris-352250/)

rboll 08-11-2005 01:01 PM

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 my.server.com 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... :scratch:


So, experts,

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

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

Any help would be appreciated!

hardcorelinux 08-12-2005 06:02 AM

Stop your server firewall(iptables) and check , telnet service is running or not.

rboll 08-12-2005 06:35 AM

Telnet to another port e.g. 22 for SSH is working!

rboll 08-12-2005 10:19 AM

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: pxx.2xx.1.215.tisdip.tiscali.de [xx.21xx1.215] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA


Any idea?


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