Host would normally be 'localhost' or '127.0.0.1' for a local machine. Using either of those will avoid any DNS lookup on a name server (on local network or Internet), so this will be prefered in comparison with using the LAN ip or global ip (and will/should also avoid issues with Firewall, SuSE AppArmor settings etc.)
With the settings that you use now, what does 'test connection' in the SSH settings page return?
(btw: I have an OpenSuSE 11 here myself but have not configured MONyog on it yet. I will try if if does not help what I wrote above)