Radius Validation

I followed everything the way it said in the articles
https://www.techrepublic.com.com/5208-6230-0.html?forumID=102&threadID=212059&messageID=2385921

am using server 2003 and ad and a wireless n gigabit security router from linksys and when my clients try to connect all it says is validating identity for ever and thats all that happens anything i could be doing wrong?