CentOS Linux release 7.8.2003 (Core)
CentOS Linux release 7.7.1908 (Core)
The following line in the clients "/etc/ssh/ssh_config" file prevents a successful connection:
Proxy command /usr/bin/sss_ssh_knownhosts_proxy -p %p %h
Commenting out this line and reloading the sshd service permits a successful connection.
Both server and host are joined to Red Hat IdM (aka IPA).
Server has MATE desktop installed. The client is session preference is configured to use "Custom desktop: /usr/bin/mate-session" as selecting MATE session type results in a failed connection.
Sound and client side printing support are disabled in the session preferences.