I am trying to enable pptp vpn via RADIUS.
I setup my internal radius servers. I enabled PPTP vpn via radius. From the Admin page, I can successfully test Radius connectivity to the server and the lookup on my username. From a client computer, the vpn fails to connect with error 691. In IAS, I see a successful login to the Radius server. Below is the UTM logs for the connection attempt. Can anyone help me understand what is wrong. Thanks!
2014:03:05-11:04:09 4 pptpd[9882]: CTRL: Client 65.191.162.150 control connection started
2014:03:05-11:04:09 4 pptpd[9882]: CTRL: Starting call (launching pppd, opening GRE)
2014:03:05-11:04:09 4 pppd-pptp[9883]: Plugin radius.so loaded.
2014:03:05-11:04:09 4 pppd-pptp[9883]: RADIUS plugin initialized.
2014:03:05-11:04:09 4 pppd-pptp[9883]: Plugin radattr.so loaded.
2014:03:05-11:04:09 4 pppd-pptp[9883]: RADATTR plugin initialized.
2014:03:05-11:04:09 4 pppd-pptp[9883]: Plugin dhcpc.so loaded.
2014:03:05-11:04:09 4 pppd-pptp[9883]: DHCPC: plugin initialized
2014:03:05-11:04:09 4 pppd-pptp[9883]: pppd 2.4.5 started by (unknown), uid 0
2014:03:05-11:04:09 4 pppd-pptp[9883]: Starting negotiation on /dev/pts/0
2014:03:05-11:04:09 4 pptpd[9882]: GRE: Bad checksum from pppd.
2014:03:05-11:04:13 4 pptpd[9882]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
2014:03:05-11:04:13 4 pppd-pptp[9883]: rc_map2id: can't find tty /dev/ in map database
2014:03:05-11:04:13 4 pppd-pptp[9883]: rc_check_reply: received invalid reply digest from RADIUS server
2014:03:05-11:04:13 4 pppd-pptp[9883]: rc_check_reply: received invalid reply digest from RADIUS server
2014:03:05-11:04:13 4 pppd-pptp[9883]: Peer username failed CHAP authentication
2014:03:05-11:04:13 4 pppd-pptp[9883]: Connection terminated.
2014:03:05-11:04:13 4 pppd-pptp[9883]: Exit.
2014:03:05-11:04:13 4 pptpd[9882]: GRE: read(fd=6,buffer=805a540,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
2014:03:05-11:04:13 4 pptpd[9882]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
2014:03:05-11:04:13 4 pptpd[9882]: CTRL: Reaping child PPP[9883]
2014:03:05-11:04:13 4 pptpd[9882]: CTRL: Client 65.191.162.150 control connection finished
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