July 7, 2021 . 1 MIN READ
I discovered that the version of PuTTY that I had been using was an old development snapshot rather than a stable release. That version did work a few weeks ago but something changed in the meantime and it stopped working. Uninstalling PuTTY and installing the current stable release (v0.67) has solved this problem.
https://laracasts.com/discuss/channels/forge/putty-fatal-error-expected-key-exchange-group-packet-from-server
