What is your connection?
If it's cable, your only going to be able to host 4-6 players max. MOH eats up a lot of bandwidth. Your upload speed will effect your clients most.
Make sure you set your max rate accordingly. Check out
http://www.mohadmin.com/nuke/modules.ph ... age&pid=18
To set your max rate depending on your upload connection.
There are also a ton of useful guides to the new MOH administrator.
I personally have never used MOHaarunner. but would ask this over at MOHadmin.com (great site if you ask me biggrin: )
Good luck with your server.