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XR 5.1.1 and Putty

Garry Peirce
Level 1
Level 1

I'm having (repeatable) trouble SSH'ing into a ASR9001 running v5.1.1 using PuTTY (6.3).

Anyone else?  

I've been using PuTTY for years without seeing this issue, so I'm thinking 5.1.1 may be acting differently.

 

I can make the session fail easily by logging in and spacing through a 'show run'.

It always fails with the connection breaking part way through the listing with 

"Disconnected: Server protocol violation: unexpected SSH2_MSG_CHANNEL_FAILURE packet"

 

The same PuTTY client works fine into ASR9001s running  4.2.3/4.3.0.

I can connect without issue using a linux OpenSSH (4.3p2) or Windows TeraTerm (4.8.1) SSH as clients,

it's just this PuTTY-v5.1.1 combination that seems to cause a problem.

 

PuTTY uses: AES256-CBC and HMAC-SHA1

TeraTerm also uses: AES256-CBC HMAC-SHA1

OpenSSH uses: AES-128 HMAC-MD5

 

fwiw, my ASR vty and ssh config is the same on 5.1.1 as it is for previous revs.   

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