This is buggy. We had it deployed on a small number of servers , basically our backup server and a few servers that needed to backup to the backup server.
We would run into problems with standard SSH connecting to HPN-SSH these bugs were confusing and difficult to debug until we realized that the difference was HPN-SSH and reverted to standard SSH all problems went away quite quickly.
We would run into problems with standard SSH connecting to HPN-SSH these bugs were confusing and difficult to debug until we realized that the difference was HPN-SSH and reverted to standard SSH all problems went away quite quickly.