[Twisted-Python] (no subject)

Itamar Turner-Trauring itamar at itamarst.org
Tue May 1 16:27:23 MDT 2012

On 05/01/2012 04:38 PM, Dmitriy Komarov wrote:
> Hi All,
> Our team is setting up Twisted to access Mercurial over SSH.
So this means SSH is on the server side, right?

> SSH connection, key exchange, and receiving large amount of data from 
> the client work nicely,
> but sending server data back to the client ends up with a PuTTY Fatal 
> Error "Incoming packet was garbled on decryption" at a random point.
> If plink compression is disabled, the error happens very rarely, but 
> overall SSH performance becomes unacceptable.
> If plink uses compression, the error occurs within 1-10 seconds from 
> starting data download.
> To make things more hectic, on a rare occasion, PuTTY reports 
> "Incorrect MAC received on packet" instead of "garbled on decryption".
> If anyone had a similar issue before, I'd appreciate any pointers on 
> resolving or avoiding it.

What version of Twisted are you using? Likewise, what versions of 
PyCrypto and pyASN1? I imagine issues could be in any of the three. If 
you're using up-to-date versions of each, I don't see any pending 
tickets or post-Twisted-12.0 bugfixes that reflect this, in which case a 
good next step would be a minimal reproducing example.

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