[openssh] Re: Frequent "Connection reset by peer"

Darren Tucker dtucker at zip.com.au
Thu Jan 31 22:15:34 EST 2008

Nadav Har'El wrote:
> On Tue, Jan 29, 2008, Tuc at T-B-O-H.NET wrote about "Re: [openssh] Re: Frequent "Connection reset by peer"":
>> 	I ran what you said, and the first one ran for about
>> 2 minutes and then :
>> Connection to closed by remote host.
>> Connection to closed.
>> 	And the 2nd time about 20 seconds before the same.
> If I understood correctly, what you ran just opened a connection, but passed
> no data for two minutes. Is it possible that your router simply disconnects
> inactive TCP connections after two minutes, in the pretext of saving memory,
> guard against DOS attacks, or who knows what?

Good point, and that reminds me: another thing to check for, 
particularly if you have links with differing MTUs, is fragmentation 


A dead giveaway for this problem is if you see a non-zero and increasing 
number in the SendQ column in the "netstat" output for the SSH 
connection (on either server or client end of the connection).

Darren Tucker (dtucker at zip.com.au)
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4  37C9 C982 80C7 8FF4 FA69
     Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.

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