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Home > Archive > Red Hat Topics > April 2006 > why is my smtp being blocked?
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why is my smtp being blocked?
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| testExpress 2006-04-27, 6:54 am |
| I've set up a Redhat box and have loaded Kerio MailServer on it. I don't
know what I did, but (I know I did something) my smtp is no longer being
allowed in. Or maybe it's not being forwarded onto Kerio.
It was working for a short while, until I "tried to make things better".
No, I don't know what specifically I did. (Go ahead and flame me, but help
me too).
I checked and I have the firewall turned off completely. I ran ethereal
(I'm not an expert with this one), and it looks like packets for port 25 are
hitting the box. But for some reason, Kerio doesn't see them.
I tried a telnet to port 25 (from behind my firewall), and got in just fine.
I looked at my router, and it say's it's forwarding the packets for port 25.
My router (Netgear) however, doesn't have a real good log, so I can't really
verify where it's forwarding them onto.
Everything points to the fact that smtp packets are hitting the server, but
the SW (Kerio) doesn't seem to see them.
One more thing. If I send an e-mail from that box, to itself. It works.
Sending outside works too.
Thanks in advance for anyones help.
Chris
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| ynotssor 2006-04-27, 6:54 am |
| "testExpress" <junk@none.com> wrote in message
news:444eaa3a$0$1588$742ec2ed@news.sonic.net
> I've set up a Redhat box and have loaded Kerio MailServer on it. I
> don't know what I did, but (I know I did something) my smtp is no
> longer being allowed in. Or maybe it's not being forwarded onto
> Kerio.
>
> It was working for a short while, until I "tried to make things
> better". No, I don't know what specifically I did. (Go ahead and
> flame me, but help me too).
It would be better if you posted the exact error/success messages you're
encountering, instead of all the arm-waving generalizations.
> I checked and I have the firewall turned off completely.
You state later that you have a Netgear firewall. How is it "turned off"?
> I ran ethereal (I'm not an expert with this one), and it looks
> like packets for port 25 are hitting the box.
"Looks like" ... how? You should post a few ethereal output lines to support
your claim.
> I tried a telnet to port 25 (from behind my firewall), and got in
> just fine.
"Got in just fine" ... what does it mean? Post the telnet session details
instead of colloquia.
> I looked at my router, and it say's it's forwarding the packets for
> port 25. My router (Netgear) however, doesn't have a real good log,
> so I can't really verify where it's forwarding them onto.
"Looked at [your] router ... it say's [sic] it's forwarding the packets for
port 25" ... how? Post the log file excerpts to support your claim. What
sort of error messages are returned when you try to send mail to yourself
from outside your domain, perhaps using a free email service or a friend?
> Everything points to the fact that smtp packets are hitting the
> server, but the SW (Kerio) doesn't seem to see them.
>
> One more thing. If I send an e-mail from that box, to itself. It
> works. Sending outside works too.
"Everything"?? You've provided no evidence that the mail server is even
listening on port 25 on the network interface(s), only on the loopback
interface 127.0.0.1. What are the results of (as root):
netstat -anp | grep ":25"
or:
lsof -i :25
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