> When this error occurs there is no record of a failure logged to
> /var/log/maillog, ie sendmail doesn't even get the connection. Here's a
> tcpdump of what i /think/ is a session that caused outlook to give the
> above error:
> As i understand it:
>> The windows machine tries to connect,
> Linux responds with a SYN + ack.
> The windows machine acks our SYN, no data.
> <30 second pause>
> The windows machine terminates the connection and acks our SYN.
> linux acks the win9x FIN
> <no response from win9x>
> linux acks the FIN again
> Win9x sends a RST.
>> This particular client was Win95 4.0.95B.
>> So my question:
>> why the 30 second pause? Why doesn't sendmail respond to the connection?
> Has anyone seen this problem before? Is it a linux tcp stack problem? or
> is it sendmail?
Have you tried manually telnetting from that Win9x box to port 25?
Is it a reverse DNS lookup issue?
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