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Endpoint Detection and Response inaccessible using putty - Error "Couldn't agree a key exchange algorithm"

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Article ID: 224135

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Updated On:

Products

Endpoint Detection and Response

Issue/Introduction

Endpoint Detection and Response inaccessible using putty - Error "Couldn't agree a key exchange algorithm"

Cause

SSH or WinSCP connection to EDR Appliance fails with a message : 
Couldn't agree a key exchange algorithm (available: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521, diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,)

The Couldn't agree a key exchange algorithm is expected behavior with older version of PuTTy or PuTTy integrated solutions like WinSCP.
 

Environment

EDR Version : 4.6.5

 

Resolution

To resolve this issue, upgrade PuTTy to a version to 0.65 or later from http://www.putty.org/.

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