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Cisco Bug: CSCus93980 - Ramdom SSH session disconnect happens on 5.1.3 using PUTTY

Last Modified

Feb 13, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

We have upgraded 4 of our ASR 9006's this evening to IOS-XR 5.1.3. After the upgrade has been complete we are receiving  random disconnects on our SSH sessions when running commands. We are using Putty as our client from a Windows box and the error from putty is "Disconnected: Received unsolicited SSH_MGS_CHANNEL_FAILURE. "

This did not happen previously and only affects our sessions connecting to our IOS-XR 5.1.3 based ASR 9006's.

The issue is easy to reproduce and the best method is to run the command "show log last 250" for example. 
The issue is only seen on ASR9K/5.1.3 with CSCus22641 or without CSCus22641. 
5.2.2 and 4.3.4 have no such issue. 
The issue is not seen if using other SSH client, for example SecureCRT, or Unix box.
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