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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: "couldn't open server" error
Date: Wed, 14 Aug 2002 14:26:39 +0200
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SpiceBug </*no_spam*/spicebug@freesurf.fr> writes:

> I elaborate : I meet this message after several successful
> synchronizations. (note : I use only one NNTP server).
>
> I suspect a timeout problem, as cited in these old numerous posts.
> (old means 1995, 1997, 1998, 1999).
>
> Moreover, I use a TCP forwarder to access the NNTP server, forwarding
> disconnections when they occur.

As I've never seen this, and I also TCP fowards all my ports via SSH,
I think there is some bad interaction between Gnus / Emacs / fowarder
happening here.  If you use the elisp primitives to open network
connections and send data through it, can you reproduce what is
happening?  See `open-network-stream', `process-send-string' etc.

> The only way to restore a good connection is to restart Gnus.
> And then it works fine.

You should always be able to do C and O in the *Server* buffer.