[c-nsp] putty SSH errors on IOS-XR 5.1.1

[Andy Ellsworth]

My kneejerk reaction was that this was the usual rekeying problem, but
Google suggests it's related to something else.

https://supportforums.cisco.com/discussion/12134596/xr-511-and-putty

   Change the following session parameter from the default of 'Auto' to
'On'.
   Connection...SSH...Bugs...'Chokes on PuTTYs SSH2 winadj request'

HTH.




On Wed, Jul 23, 2014 at 7:43 AM, <Vinny_Abello at dell.com> wrote:

> Hello,
>
> I've got a pair of new ASR-9904 routers running IOS-XR 5.1.1 to which I've
> applied SP2. Both pre and post-SP2 I keep having connectivity problems with
> my normal SSH client, putty on Windows. When a lot of data is being sent at
> once from the router to my client, putty will disconnect and give me the
> error: "Disconnected: Server protocol violation: unexpected
> SSH2_MSG_CHANNEL_FAILURE packet". I can connect to the same device all day
> long using OpenSSH 6.2p2 from a FreeBSD machine with no issues. Has anyone
> else seen this issue and possibly have a workaround or settings to tweak in
> putty to prevent it from constantly being disconnected? FWIW, I've
> experienced similar incompatibilities with putty in the past with other
> network vendors, but it seems the network vendors always acknowledge the
> issue on their end and fix it in future code that they release rather than
> a fix for putty coming out to address it. I'm suspecting putty may be
> overly strict with certain protocol compliance!
>  . Regardless, it would just be nice to use my tools that I manage all my
> other devices with and not have to deviate to a workaround. I do have some
> ASR-9001's also in production but they are still running older 4.2.3 code
> and I've never had this issue on them.
>
> TIA
>
> -Vinny
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