IBM Support

QRadar: SSH connections to QRadar using PuTTY may fail with a fatal error after upgrading to 7.2mr3



You may find that you receive a fatal error when attempting a SSH connection to QRadar using PuTTY after upgrading to QRadar 7.2mr3.


After the upgrade, the following PuTTY exception may be received:

PuTTY Fatal Error:
Couldn't agree a client-to-server cipher (available: aes128-ctr,aes192-ctr,aes-256-ctr,arcfour256,arcfour128,arcfour)


An older version of PuTTY may be in use which does not support the cipher used by this version of QRadar.

Resolving The Problem

Upgrading to PuTTY version .60 or later will address the issue.

Where do you find more information?

[{"Product":{"code":"SSBQAC","label":"IBM Security QRadar SIEM"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Component":"Integrations - 3rd Party","Platform":[{"code":"PF016","label":"Linux"}],"Version":"7.2","Edition":"All Editions","Line of Business":{"code":"LOB24","label":"Security Software"}}]

Document Information

Modified date:
16 June 2018