Funk Steel-Belted Radius Server

sorry mr. moderator,
i know this is wrong place to ask...
if you want to remove this thread, it doesn matter..
i just stuck on this matter..dont know where to ask..
lack of info on the net...

i know people here have more knowledges on everything, not just VB right? :D

im working on funk steel-belted radius server(taiwan)...everything is fine on the configuration but when it comes to the most important feature..which is concurrent access...it didnt works.user can access the site using same login after 3 minutes the first login even i set the config file to 1 concurrent user.
i dont know where else to change.

if anyone here familiar with this please help me...

thanks in advance...