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Date: Wed, 9 Apr 1997 21:27:52 -0700 (PDT)
From: Doug White <dwhite@gdi.uoregon.edu>
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Reply-To: Doug White <dwhite@resnet.uoregon.edu>
To: Adrian Carter <adrian@apic.net>
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Subject: Re: Weird Network Behaviour 
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On Wed, 9 Apr 1997, Adrian Carter wrote:

> Got a bit of a weird one here. We are an ISP running pretty much as a
> FreeBSD house, with them being a mixture of 2.1.5's (only one machine, due
> to the fact it is offsite and I havent had the time to go onsite and
> upgrade) and 2.1.7's.
> 
> In the last 4 days the machine running 2.1.5 has been sporadically
> 'dropping data'. In that I mean, as an example, If youy try and send a
> message via that machines SMTP port, communication works fine for the HELO,
> MAIL FROM, and RCPT TO. The client then sends the DATA command, and
> according to sendmail logs, the machine reports a 354 message and awaits
> the data. However, the end-user program never see's the 354 message, and
> eventually times out. If you use the same machine, with the same e-mail
> message, and use a different SMTP host, it works fine. 

The machine(s) in question don't happen to be living behind any Xylogics
equipment, do they?  

Try disabling tcp_extensions in /etc/sysconfig.

Doug White                              | University of Oregon  
Internet:  dwhite@resnet.uoregon.edu    | Residence Networking Assistant
http://gladstone.uoregon.edu/~dwhite    | Computer Science Major