Troubleshooting
Problem
While trying to SSH to the HMC latest version using PuttY it'll come back with an error and won't allow to SSH.
Symptom
After upgrading the HMC to version 9.1 or later, user might be not be able to SSH to the HMC via PuTTy getting error "Couldn't agree a key exchange algorithm":
Cause
The reason for the problem is that some SSH Cryptographic Settings were deprecated and additional fixes for vulnerabilities were added (compromised cyphers were removed) in the HMC for security reasons.
Diagnosing The Problem
User have to be able to SSH from any other command prompt except PuTTy.
Resolving The Problem
To resolve this issue, kindly update PuttY application to the latest version to be compatible with the newer HMC versions security protocols.
Related Information
Document Location
Worldwide
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Document Information
More support for:
Hardware Management Console V9
Software version:
HMC V9.1 or later
Operating system(s):
AIX, HMC, IBM i
Document number:
1105701
Modified date:
22 September 2021
UID
ibm11105701
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