Symptoms

Unable to use PuTTY to connect to an Avamar grid after an upgrade. Connections fail with the following error: Note: This issue has also been observed with other Dell Products.

Cause

When the Operating System (OS) is upgraded, it updates the /etc/ssh/ssh_config file with ciphers that older versions of PuTTY do not support. PuTTY versions earlier than v.59 do not include the CTR layer encryption mode required to communicate with the updated Avamar grid.

Resolution

Update the version of PuTTY to a later version (the recommended version is v.67 or higher): 1. Go to the PuTTY download page. http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html (External Link) 2. Select an applicable version (and type) of PuTTY for your environment. 3. Download and install PuTTY. Note: If the download page is blocked, or elevated privileges are required to install programs, customers must seek assistance from their local IT teams to update the PuTTY version. 4. Test the connection to the Avamar grid.

Support Cases