Hi there,
I've posted some messages concerning this strange "pop3 connection reset
after 1 minute". I just discovered the reason for the problem, but I still
don't have a solution.
I'm using "checkpasswordnt" for my authentication issues (so that all users
can be authenticated with our NT PDC). I just changed this back to the
normal checkpassword program and tried again with an appropriate account.
Now it works. No connection reset, nothing. So checkpasswordnt seems to make
problems.
But, as I understand, checkpassword is only used to authenticate the
connection in the first place. After that it's not accessed again? There
seems to be some kind of timeout after one minute, but where?
This is the ps aux output while running a pop3 session:
root 6176 0.0 0.2 1224 344 pts/0 S 11:43 0:00
/var/qmail/bin/qmail-popup wetzel-office.com /bin/checkpasswordnt
/var/qmail/bin/qmail-pop3d Maildir
jhassler 6177 0.0 0.3 1236 396 pts/0 S 11:43 0:00
/var/qmail/bin/qmail-pop3d Maildir
One thing to mention: I certainly don't like this NT authentication stuff,
but in this environment its needed at the moment (can't change it).
Sorry for not mentioning checkpasswordnt in the first place, but I thought
this would be the last place the problem could occur.
I tried several things. tcpdump output is not very helpful. After the
initial authentication packets there is a "NBT Session Keepalive" packet
after 20 seconds. After this packet there is no other traffic to or from the
NT server. I thought there would be something after exactly 60 seconds, but
there is nothing. I'm also confused about this Keepalive packet, because the
session should end after the first authentication transfers, shouldn't it?
Strange, again: I use this "Mrs. Brisby" version of qmail-smtpd together
with checkpasswordnt to implement "SMTP AUTH". This works without any
problems. The same packets are travelling through the cable, there is also
this Keepalive packet, but the connection is not reset after 60 seconds.
So there seems to be something about checkpasswordnt qmail-pop3d or
qmail-popup don't like. Maybe an Anti-M$-check :-)
If anyone on this list is also using checkpasswordnt and doesn't have this
problem then the NT server is the "evil box". That's nothing new, indeed,
but this would be off-topic for this list.
I'll further try finding a solution, maybe someone of you has a clue where
the problem might be.
Some day... I'll throw these NT things out. Certainly.
Thanks again for your help, I really appreciate it.
Jens
