[Serusers] please help me about how to config radiusclient!

Hi all, I wish to use softphone X-lite on SER and radius in db_mode. When I installed both freeradius 1.0.4 and radiusclient 0.4.3 on the same server which ser 0.8.14 has installed on, I could log in X-lite through radius authorization. And now I want radiusclient (on server A) to send the request to a remote radius server (on server B) to realize authorization. I have changed those config files: /usr/local/etc/radiusclient/servers, /usr/local/etc/radiusclient/radiusclient.conf and /usr/local/etc/raddb/clients.conf as the document (http://www.iptel.org/ser/doc/ser_radius/ser_radius.html#AEN193) did. Then I test the radius server as the above document said on server A: radclient -f digest server B auth testing123 and I received expected replied message from server B. But when I log in x-lite, there are error messages: Sep 29 17:11:06 localhost ser[4408]: rc_ip_hostname: couldn't look up host by addr: DA61FC29 Sep 29 17:11:06 localhost ser[4408]: rc_send_server: no reply from RADIUS server unknown:1812 How come? Did I mis-config anything? Many thanks for your reply! Shuai http://www.goldentek.biz