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OCI : SSH Login Failed Due To Protocol Mismatch

in Linux

Applies To:

Oracle Cloud Infrastructure

Oracle Linux - Version 6


Symptoms

User is not able to login using private key with the following scenarios:

  • Connection using “ssh” will fail with:
Protocol major versions differ: 2 vs. 1
  • Using putty, depending on the version it can fail with:
SSH protocol version 2 required by our configuration but remote only provides (old, insecure) SSH-1
  • Or, in case and old putty version is used:
No supported authentication methods available


Cause

The server is configured to use on SSH protocol version 1, and the SSH private key was created for version 2


Solution

SSH protocol 1 is not required, change the configuration to use  the default, protocol version 2.

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