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Error: "expected key exchange group packet from server” when using PuTTY to access ProxySG or ASG


Article ID: 170327


Updated On:


Advanced Secure Gateway Software - ASG ProxySG Software - SGOS


When using SSH in PuTTY to access ProxySG or Advanced Secure Gateway (ASG), you receive the following error:

  • PuTTY Fatal Error: expected key exchange group packet from server.


  1. In PuTTY, in the left pane, navigate to Connection > SSH > Kex.
  2. Under Algorithm selection policy, select "Diffie-Hellman group exchange."
  3. Click Down. This moves "Diffie-Hellman group exchange' out of the first postion, to change the algorithm that is used.
  4. Click Open.