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Home > Success Center > Log & Event Manager (LEM) > PuTTY error: Couldn't agree a client-to-server cipher

PuTTY error: Couldn't agree a client-to-server cipher

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Updated March 14, 2017


This article describes an error when using PuTTY to open an SSH session to the LEM appliance. In this scenario PuTTY returns a fatal error:

Couldn't agree a client-to-server cipher (available: aes256-ctr,ase192-ctr,ase128-ctr)


All LEM versions


This error is caused by an issue with the previous versions of PuTTY. To resolve, upgrade to the latest version.


Last modified
16:40, 13 Mar 2017