PPTP does not function properly. When running with local accounts, the first attempt always fails with a 737 (loopback detected). The second or third or fourth attempts may work.
With RADIUS Authentication, the connection never works. The following is the log file of what ASL reports:
2004:04:28-10:58:06 (none) pptpd[16824]: MGR: Launching /usr/local/sbin/pptpctrl to handle client
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: local address = 10.67.86.1
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: remote address = 10.67.86.2
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: pppd options file = /etc/ppp/options
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Client 12.5.250.194 control connection started
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Received PPTP Control Message (type: 1)
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Made a START CTRL CONN RPLY packet
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: I wrote 156 bytes to the client.
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Sent packet to client
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Received PPTP Control Message (type: 7)
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Set parameters to 1525 maxbps, 64 window size
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Made a OUT CALL RPLY packet
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Starting call (launching pppd, opening GRE)
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: pty_fd = 5
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: tty_fd = 6
2004:04:28-10:58:06 (none) pptpd[16825]: CTRL (PPPD Launcher): Connection speed = 115200
2004:04:28-10:58:06 (none) pptpd[16825]: CTRL (PPPD Launcher): local address = 10.67.86.1
2004:04:28-10:58:06 (none) pptpd[16825]: CTRL (PPPD Launcher): remote address = 10.67.86.2
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Plugin /usr/sbin/radius.so loaded.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: RADIUS plugin initialized.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Plugin /usr/sbin/radattr.so loaded.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: RADATTR plugin initialized.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Plugin /usr/sbin/radius.so loaded.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: RADIUS plugin initialized.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Plugin /usr/sbin/radattr.so loaded.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: RADATTR plugin initialized.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: pppd 2.4.2 started by (unknown), uid 0
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: I wrote 32 bytes to the client.
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Sent packet to client
2004:04:28-10:58:06 (none) pppd-pptp[16825]: using channel 20
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Starting negotiation on /dev/ttyp0
2004:04:28-10:58:06 (none) pppd-pptp[16825]: sent [LCP ConfReq id=0x1 ]
2004:04:28-10:58:06 (none) pptpd[16824]: GRE: Bad checksum from pppd.
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Received PPTP Control Message (type: 15)
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Got a SET LINK INFO packet with standard ACCMs
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [LCP ConfReq id=0x0 ]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: sent [LCP ConfRej id=0x0 ]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [LCP ConfRej id=0x1 ]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: sent [LCP ConfReq id=0x2 ]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [LCP ConfReq id=0x1 ]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: sent [LCP ConfAck id=0x1 ]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [LCP ConfAck id=0x2 ]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: sent [LCP EchoReq id=0x0 magic=0xff6215ec]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: sent [CHAP Challenge id=0x2 , name = "pptp"]
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Received PPTP Control Message (type: 15)
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [LCP code=0xc id=0x2 61 99 4c 85 4d 53 52 41 53 56 35 2e 31 30]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: sent [LCP CodeRej id=0x3 0c 02 00 12 61 99 4c 85 4d 53 52 41 53 56 35 2e 31 30]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [LCP code=0xc id=0x3 61 99 4c 85 4d 53 52 41 53 2d 31 2d 57 32 4e 5a 34 58 36 39 30 32]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: sent [LCP CodeRej id=0x4 0c 03 00 1a 61 99 4c 85 4d 53 52 41 53 2d 31 2d 57 32 4e 5a 34 58 36 39 30 32]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [LCP EchoRep id=0x0 magic=0x61994c85]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [CHAP Response id=0x2 , name = "tallison"]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rc_map2id: can't find tty /dev/ in map database
2004:04:28-10:58:06 (none) pppd-pptp[16825]: sent [CHAP Success id=0x2 "S=07149F98931C007058A4CD1A50C73B2CA3B1AB4D"]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Using interface ppp0
2004:04:28-10:58:06 (none) pppd-pptp[16825]: MPPE required, but keys are not available. Possible plugin problem?
2004:04:28-10:58:06 (none) pppd-pptp[16825]: sent [LCP TermReq id=0x5 "MPPE required but not available"]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [CCP ConfReq id=0x4 ]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Discarded non-LCP packet when LCP not open
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [IPCP ConfReq id=0x5 ]
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Received PPTP Control Message (type: 15)
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Got a SET LINK INFO packet with standard ACCMs
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Discarded non-LCP packet when LCP not open
2004:04:28-10:58:06 (none) pppd-pptp[16825]: rcvd [LCP TermAck id=0x5 "MPPE required but not available"]
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Connection terminated.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Connect time 0.0 minutes.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Sent 0 bytes, received 0 bytes.
2004:04:28-10:58:06 (none) pppd-pptp[16825]: Exit.
2004:04:28-10:58:06 (none) pptpd[16824]: GRE: read(fd=5,buffer=804e7a0,len=8196) from PTY failed: status = -1 error = Input/output error
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: PTY read or GRE write failed (pty,gre)=(5,6)
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Closing child BCrelay with pid 0
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Closing child ppp with pid 16825
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Client 12.5.250.194 control connection finished
2004:04:28-10:58:06 (none) pptpd[16824]: CTRL: Exiting now
2004:04:28-10:58:06 (none) pptpd[16820]: MGR: Reaped child 16824
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