RouterOS 7.10 PuTTY 0.71 Error Resolution

RouterOS General
1

RouterOS 7.7 /ip ssh set strong-crypto=yes works with PuTTY 0.71
RouterOS 7.10 /ip ssh set strong-crypto=no works with PuTTY 0.71
RouterOS 7.10 /ip ssh set strong-crypto=yes works with PuTTY 0.78

RouterOS 7.10 /ip ssh set strong-crypto=yes fails with PuTTY 0.71
FATAL ERROR: Couldn’t agree a host key algorithm (available: rsa-sha2-256)

2

In between 0.71 and 0.78 there were various fixes for putty.

So where is the problem ? The latest version works, no ?
It was released in oktober 2022, so why go back to an older version ?

3

Issue is PuTTY 0.71 and RouterOS 7.10 with strong-crypto are incompatible. The resolutions are

  • upgrade PuTTY
  • downgrade RouterOS
  • disable RouterOS 7.10 strong-crypto

Any one or combination will do.

My case was failing to follow PuTTY releases.