Re: Cable modem/router causes error 10054, "Connection was forcibly reset by remote host"

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From: Arkady Frenkel (arkadyf_at_hotmailxdotxcom)
Date: 01/18/05 

Date: Tue, 18 Jan 2005 10:25:36 +0200

Are you sure that server app still opened and it's peer socket opened too.
Check that with netstat from dos box
Arkady

"Randolph Neall" <randolphneall@veracitycomputing.com> wrote in message
news:edFnGPR$EHA.1084@tk2msftngp13.phx.gbl...
> We have an application where we control both ends of a TCP connection,
with
> both server and client written in C#. Once sockets are created we expect
> them to remain alive for hours on end. We have success for all sites
except
> the one that uses a cable modem/router. What happens at this site is quite
> simple. If there is no activity on the socket for five minutes, the next
> time our application attempts to communicate over the socket, the socket
is
> discovered by our application to be invalid, and our application then
issues
> the reset exception 10054. We have examined Netmon logs and have found
that
> no resets are issued by our server or anything else visible on the wire.
The
> first sign of the problem in the logs is when our app tries to make
contact
> with our server, which fails after five send retries.
>
> And it happens not only with our server or our application. We found the
> same to be true with an FTP client accessing an FTP site totally unrelated
> to our server. After five minutes, the FTP client, like our application
> client, made five unsuccessful attempts to use its existing connection,
then
> successfully re-initialized a new connection.
>
> The cable connection itself does not die. In other words, the internet
> access remains uninterrupted. For that reason, attempts to re-establish
the
> connection (by initializing new sockets) always succeed. Our application
can
> always reconnect.
>
> The problem exists only when a router sits between the cable modem and the
> end user's machine. Without a router involved, that is, when the modem is
> connected directly to a single computer, the problem does not occur.
> Replacing the router with a different router, even a different brand of
> router, such as LinkSys does not help.
>
> Our application does not have this problem with clients using DSL, ISDN,
T1,
> or even dailup, or even when lots of packets are being lost. It's just
this
> one site using a cable ISP where the problem is.
>
> So here are my questions:
>
> 1. Does a cable modem know when it is dealing with a router rather than a
> user's computer and behave differently toward the one than the other?
>
> 2. Does the cable company central office router know when one of its
modems
> is dealing with a router (as opposed to a single computer) and behave
> differently if it is?
>
> 3. Have any of you ever experienced this?
>
> This is developing into something ugly between us, the cable company, and
> our client. The cable company blames us. They insist that their
connections
> never die and that nothing in their system would cause the behavior we are
> seeing. And they are threatening to bill us for all the time they spent
with
> this client prior to our intensive research and involvement this weekend.
> What they did not do was run Netmon or NetStat, as did we.
>
> Thanks for any help,
>
> Randy Neall
>
>
>
>

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