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Over the past couple of months, I've been noticing an annoying tendency for SSH sessions to some of my office servers to be reset if they're left idle for about a minute. So much so that, unless I use 'screen' on the servers to preserve what I'm doing, I end up losing whatever I might be doing just by flipping over to another workspace.
I've tested this behaviour using three different dongles (E1752, E1820 and MF190) connected to the USB port on the laptop (Toshiba Satellite 850) as well as via several different 3G routers (Huawei HG532c, Billion BiPAC 7300NX, TP-Link TL-MR3220 and Tenda 3G611R+) with prepaid SIMs from Vodacom, MTN and CellC. I've also tested for the same behaviour on a Neotel datacard (AC2736), both direct and via a Tenda 3G611R+ router. Vodacom and MTN will let the session run idle for over an hour, Neotel will leave it alone until I decide to close it and CellC drops it after a minute or so. There's some variability on CellC - sometimes a few seconds, sometimes a couple of minutes, but an idle SSH session will get dropped very quickly, and it's always the same:
> Write failed: Broken pipe
I'm sure it's not a signal strength issue - MTN is around 22% on a good day, Vodacom around 32%, CellC is pretty much always up around 60%. I can't see what the Neotel signal strength is like. At the moment, all I can conclude is that CellC has got something going on their network that is killing off sessions and it's making life really difficult.
*Trybble
Over the past couple of months, I've been noticing an annoying tendency for SSH sessions to some of my office servers to be reset if they're left idle for about a minute. So much so that, unless I use 'screen' on the servers to preserve what I'm doing, I end up losing whatever I might be doing just by flipping over to another workspace.
I've tested this behaviour using three different dongles (E1752, E1820 and MF190) connected to the USB port on the laptop (Toshiba Satellite 850) as well as via several different 3G routers (Huawei HG532c, Billion BiPAC 7300NX, TP-Link TL-MR3220 and Tenda 3G611R+) with prepaid SIMs from Vodacom, MTN and CellC. I've also tested for the same behaviour on a Neotel datacard (AC2736), both direct and via a Tenda 3G611R+ router. Vodacom and MTN will let the session run idle for over an hour, Neotel will leave it alone until I decide to close it and CellC drops it after a minute or so. There's some variability on CellC - sometimes a few seconds, sometimes a couple of minutes, but an idle SSH session will get dropped very quickly, and it's always the same:
> Write failed: Broken pipe
I'm sure it's not a signal strength issue - MTN is around 22% on a good day, Vodacom around 32%, CellC is pretty much always up around 60%. I can't see what the Neotel signal strength is like. At the moment, all I can conclude is that CellC has got something going on their network that is killing off sessions and it's making life really difficult.
*Trybble
