Posted on August 20, 2016
Fixing Raspberry Pi 3 SSH
From https://expresshosting.net/ssh-hanging-authentication/ “Edit the two configuration files for the Raspberry Pi: /etc/ssh/ssh_config /etc/ssh/sshd_config And add the following line to the bottom of the configuration file: IPQoS 0x00 And restart sshd (sudo service sshd restart).”