Server not responding to requests

Hi All, I have freeradius 1.1.7 running on RHEL 5. radtest works with a local user setup, and also with authentication via Active Directory. However, anything outside the radius server host does not get a reply. I have configured a Multitech MA820 and also tried ntradping, and both get the same results - "Could not receive a response from server" is the message when I use ntradping, and "Server did not respond in a timely manner" is the response when I try to connect from the Multitech. Is there some setting I need to check to make sure external access is enabled? Thanks in advance ~ Cindy Yoho Systems Engineer United Methodist Publishing House Nashville, TN