i use netstat and found there is radius listen on 1812, 1813 and 1814 using udp
i shut down all the iptables both on the server of pptp and the server radius

but the pptp can't be authenticated , the log is

RADIUS plugin initialized.
Jun  8 15:26:29 mountainview pppd[4604]: Plugin /usr/lib64/pppd/2.4.4/radattr.so loaded.
Jun  8 15:26:29 mountainview pppd[4604]: RADATTR plugin initialized.
Jun  8 15:26:29 mountainview pppd[4604]: Plugin /usr/lib64/pptpd/pptpd-logwtmp.so loaded.
Jun  8 15:26:29 mountainview pppd[4604]: pptpd-logwtmp: $Version$
Jun  8 15:26:29 mountainview pppd[4604]: pppd 2.4.4 started by root, uid 0
Jun  8 15:26:29 mountainview pppd[4604]: Using interface ppp0
Jun  8 15:26:29 mountainview pppd[4604]: Connect: ppp0 <--> /dev/pts/1
Jun  8 15:27:03 mountainview pppd[4604]: rc_send_server: no reply from RADIUS server puppet:1812
Jun  8 15:27:03 mountainview pppd[4604]: Peer test failed CHAP authentication
Jun  8 15:27:03 mountainview pppd[4604]: Connection terminated.
Jun  8 15:27:03 mountainview pppd[4604]: Exit.


it says there is not reply

2010/6/8 Alan Buxey <A.L.M.Buxey@lboro.ac.uk>
Hi,
> i can start freeradius ok, but my pptp can't remote access radius server, I telnet 1812 or 1813 , but both are connection refused, i don't know what to do with this situation

firewall eg iptables , on the server you put freeradius on?

alan
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Spacelee