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cannot received email from pop3

cannot received email from pop3

Post by John » Wed, 12 Sep 2007 16:09:36



Dear all,

Our redhat 9 server runs smoothly?M However, recently, the outlook express
cannot connect to such server to receive email, Anyway, when I test the pop
server by using telnet "192.168.0.11 110"
the server can give


Trying 192.168.0.10...
Connected to ns.xx-xx.com (192.168.0.10).
Escape character is '^]'.
Connection closed by foreign host.

It seems not to refuse the request but close the connection immediately.

Why? Please give me helping hand, thanks.

Regards,
Simon

 
 
 
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cannot received email from pop3

Post by SRG » Thu, 13 Sep 2007 18:33:56



> Dear all,

> Our redhat 9 server runs smoothly?M However, recently, the outlook express
> cannot connect to such server to receive email, Anyway, when I test the pop
> server by using telnet "192.168.0.11 110"
> the server can give


> Trying 192.168.0.10...
> Connected to ns.xx-xx.com (192.168.0.10).
> Escape character is '^]'.
> Connection closed by foreign host.

> It seems not to refuse the request but close the connection immediately.

> Why? Please give me helping hand, thanks.

> Regards,
> Simon

Their could be lot of reasons, what mail server are you using?

 
 
 
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cannot received email from pop3

Post by John » Wed, 12 Sep 2007 16:31:27


 Dear all,

 Our redhat 9 server runs smoothly?M However, recently, the outlook express
 cannot connect to such server to receive email, Anyway, when I test the pop
 server by using telnet "192.168.0.11 110"  the server can give


 Trying 192.168.0.10...
 Connected to ns.xx-xx.com (192.168.0.10).
 Escape character is '^]'.
 Connection closed by foreign host.

 It seems not to refuse the request but close the connection immediately.


tcp        0      0 *:pop3s                 *:*                     LISTEN
tcp        0      0 *:pop2                  *:*                     LISTEN
tcp        0      0 *:pop3                  *:*                     LISTEN

Why? Please give me helping hand, thanks.

 Regards,
 Simon

 
 
 
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cannot received email from pop3

Post by Tilman Schmid » Thu, 13 Sep 2007 19:43:35


John schrieb:

>  Dear all,

>  Our redhat 9 server runs smoothly?M However, recently, the outlook express
>  cannot connect to such server to receive email, Anyway, when I test the pop
>  server by using telnet "192.168.0.11 110"  the server can give


>  Trying 192.168.0.10...
>  Connected to ns.xx-xx.com (192.168.0.10).
>  Escape character is '^]'.
>  Connection closed by foreign host.

>  It seems not to refuse the request but close the connection immediately.


> tcp        0      0 *:pop3s                 *:*                     LISTEN
> tcp        0      0 *:pop2                  *:*                     LISTEN
> tcp        0      0 *:pop3                  *:*                     LISTEN

> Why? Please give me helping hand, thanks.

Difficult if you give so precious little information about your setup.
But in general terms:
- Check the network connection between the client and server.
- In particular check if there are any firewalls/filters active between
  or on either of them.
- Check the log of your POP3 server software (whatever it is) for any
  traces of your connection attempts and reasons for rejection.
- Run netstat with the -p option to see if the process listening on the
  POP3 port is the one you think it is.
- As the problem started recently, find out what (was) changed between
  the last time it worked correctly and the first time it didn't work
  anymore.
HTH
T.

--
Please excuse my bad English/German/French/Greek/Cantonese/Klingon/...

 
 
 
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cannot received email from pop3

Post by Dave Uhrin » Thu, 13 Sep 2007 23:43:55



>  Our redhat 9 server runs smoothly?M

RHL-9 was EOL'd years ago and no updates are now available.  Install an
OS which is currently supported.  If you do not wish to pay Red Hat their
license fee for RHEL then consider using CentOS which is almost identical
to the Red Hat product.


>  Connected to ns.xx-xx.com (192.168.0.10). Escape character is '^]'.
>  Connection closed by foreign host.

The default installation of RHL provides a firewall (iptables) which
blocks incoming port 110.  Edit your iptables rules file to permit access
to port 110 and execute /etc/init.d/iptables restart.
 
 
 
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cannot received email from pop3

Post by Niels Bagges » Thu, 13 Sep 2007 23:43:38




> Trying 192.168.0.10...
> Connected to ns.xx-xx.com (192.168.0.10).
> Escape character is '^]'.
> Connection closed by foreign host.
> It seems not to refuse the request but close the connection immediately.

A common reason for such behaviour is TCP wrappers. Whappers. Have you
changed your hosts.allow or hosts.deny?

/NIels

--

The purpose of computing is insight, not numbers  --  R W Hamming

 
 
 
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cannot received email from pop3

Post by Bill Col » Fri, 14 Sep 2007 11:30:55





[...]

> >  Connected to ns.xx-xx.com (192.168.0.10). Escape character is '^]'.
> >  Connection closed by foreign host.

> The default installation of RHL provides a firewall (iptables) which
> blocks incoming port 110.  Edit your iptables rules file to permit access
> to port 110 and execute /etc/init.d/iptables restart.

That underlying cause would not be consistent with a connection opening
but immediately closing. That sort of behavior is idiosyncratic of a
service that is running out of inetd/xinetd accessed from an address
which is prohibited by TCP wrapper config.

--
Now where did I hide that website...

 
 
 
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cannot received email from pop3

Post by Dave Uhrin » Fri, 14 Sep 2007 12:45:23






> [...]

>> >  Connected to ns.xx-xx.com (192.168.0.10). Escape character is '^]'.
>> >  Connection closed by foreign host.

>> The default installation of RHL provides a firewall (iptables) which
>> blocks incoming port 110.  Edit your iptables rules file to permit
>> access to port 110 and execute /etc/init.d/iptables restart.

> That underlying cause would not be consistent with a connection opening
> but immediately closing. That sort of behavior is idiosyncratic of a
> service that is running out of inetd/xinetd accessed from an address
> which is prohibited by TCP wrapper config.

Yeah, I realized that after a more careful look at his telnet session.
 
 
 
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cannot received email from pop3

Post by Pascal Hambour » Fri, 14 Sep 2007 18:15:11


Hello,

Bill Cole a crit :


>>> Connected to ns.xx-xx.com (192.168.0.10). Escape character is '^]'.
>>> Connection closed by foreign host.

> That sort of behavior is idiosyncratic of a
> service that is running out of inetd/xinetd accessed from an address
> which is prohibited by TCP wrapper config.

Or a service which segfaults because of a disk cache corruption in RAM.
I've had that a couple of time on a machine with faulty RAM which caused
one error average per year. Took time to diagnose.
 
 
 
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