[mosh-devel] Mosh connections didn't come back after ca. 18000 sec over 2x NAT

[Axel Beckert]

Hi,

On Mon, Dec 31, 2012 at 01:44:34AM +0100, Christoph von Stuckrad wrote:
> On 30.12.2012 23:55, Axel Beckert wrote:
> ...
> > And now that you mention it: That clock still works, i.e. it's updated
> > on the client. It updates once a second, but the blue bar on top is
> > still there and says "mosh: Last reply 45804 seconds ago. [To quit:
> > Ctrl-^ .]". But nothing I type is shown on the terminal while the
> > clock still continues to update the time every second.
> 
> This really sounds strange, so the client is updating received data
> to its display, but it 'does not really know' that it got the connection
> back and so does not send?

It looks like the data sent from the client is not (correctly)
received on the server side.

> You can check, whether your 'screen' still is accepting input, by
> accessing the same 'screen-window' from another session by
> connecting to it via "screen -S ...name... -x"

Works as expected: I can type stuff and it shows up in the mosh
session, too.

But not all my sessions that hung that way had a screen session
behind. It was just the one I've chosen for tcpdumping and one of
those which updates each second. There were at least four sessions
to two hosts which had no screen session attached and still behaved
that way.

> I think I might have had a situation as the above, but could not
> find out, what was happening (I was riding a car and used a slow
> lossy link, so I assumed that to be lost).

Interesting. So a situation to cause this may be more common than I
thought.

Here it's a stationary link, but just over EDGE and still with varying
signal quality (at least according to the APs signal strength
indicator).

		Kind regards, Axel
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