Hi John, On Di 06 Mär 2012 23:20:54 CET "John A. Sullivan III" wrote:
On Tue, 2012-03-06 at 23:12 +0100, Mike Gabriel wrote:Hi John, On Di 06 Mär 2012 23:00:35 CET "John A. Sullivan III" wrote: > On Tue, 2012-03-06 at 22:55 +0100, Mike Gabriel wrote: >> Hi guys, >> >> On Di 06 Mär 2012 18:48:12 CET "John A. Sullivan III" wrote: >> >> > On Tue, 2012-03-06 at 18:21 +0100, Mihai Moldovan wrote: >> >> - sometimes, I have to resume a session, restart the client, >> >> suspend the session >> >> and resume it again for it to be usable (first time resuming will >> >> just close the >> >> connection to the server), BUT IIRC this happens on Linux, too, >> so I can't >> >> actually blame the OS X part... (plus, it only happens sometimes. :() >> >> > <snip> >> > I have noticed that problem in Linux. I think it is an SSH timing >> > issue. The connecting, suspending, reconnecting is not actually doing >> > anything, I believe, except functioning as a rudimentary clock. If one >> > just waits five minutes after being abruptly disconnected, all >> > reconnects fine :( - John >> >> When writing the connection/tunneling code of python-x2go I observed >> something similar. The problem with port forwarding requests (both >> reverse or non-reverse) is a situation when (after suspend) the ports >> do no get closed properly. We always have to make sure to properly >> cancel port forwarding requests before we disconnect from a SSH session. > <snip> > So how should we respond if the network connection is broken uncleanly, > e.g., the WAN or Internet connection drops or the client computer > crashes? What I do is, I try to connect and if that fails, I try to cancel the port forwarding requests. This mostly works and sometimes also fails.<snip> Yes, but that is what we do as users. What can we do as developers to detect and correct this situation so users do not have to do this? Thanks - John
I have implemented this in the python-x2go code. I am saying this from the developer's point of view.
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