[pptp-server] Newbie Help with PPTP and win2k client

[Greg Kopp]

I have a win2k client setup to make a PPTP connection to PoPToP v. 1.0.1
with PPP version 2.3.11 on a redhat 7.0 installation.

When I try and make a connection, it fails "The PPP link protocol has been
terminated." Here is and exerpt my /var/log/messages file. Can someone help
this newbie debug it?

Sep 17 12:51:59 paris pptpd[8163]: CTRL: Client 207.206.15.108 control
connection started
Sep 17 12:51:59 paris pptpd[8163]: CTRL: Starting call (launching pppd,
opening GRE)
Sep 17 12:51:59 paris kernel: CSLIP: code copyright 1989 Regents of the
University of California
Sep 17 12:51:59 paris kernel: PPP: version 2.3.7 (demand dialling)
Sep 17 12:51:59 paris kernel: PPP line discipline registered.
Sep 17 12:51:59 paris insmod: Note: /etc/modules.conf is more recent than
/lib/modules/2.2.16-22/modules.dep
Sep 17 12:51:59 paris kernel: registered device ppp0
Sep 17 12:51:59 paris pppd[8164]: pppd 2.3.11 started by root, uid 0
Sep 17 12:51:59 paris pppd[8164]: Using interface ppp0
Sep 17 12:51:59 paris pppd[8164]: Connect: ppp0 <--> /dev/pts/2
Sep 17 12:51:59 paris pptpd[8163]: GRE: Discarding duplicate packet
Sep 17 12:52:01 paris pppd[8164]: peer refused to authenticate: terminating
link
Sep 17 12:52:01 paris pptpd[8163]: CTRL: Ignored a SET LINK INFO packet with
real ACCMs!
Sep 17 12:52:01 paris pptpd[8163]: CTRL: Ignored a SET LINK INFO packet with
real ACCMs!
Sep 17 12:52:01 paris pptpd[8163]: CTRL: Error with select(), quitting
Sep 17 12:52:01 paris pptpd[8163]: CTRL: Client 207.206.15.108 control
connection finished
Sep 17 12:52:01 paris pppd[8164]: Connection terminated.
Sep 17 12:52:01 paris pppd[8164]: tcflush failed: Input/output error
Sep 17 12:52:01 paris pppd[8164]: Exit.

Here's a tcpdump of the interface:

[root at paris /root]# tcpdump -i eth1 -n proto 47 or port 1723
Kernel filter, protocol ALL, datagram packet socket
tcpdump: listening on eth1
12:51:59.708073 < 207.206.15.108.1250 > 207.206.15.134.1723: S
3978705535:3978705535(0) win 16384 <mss 1460,nop,nop,sackOK> (DF)
12:51:59.708768 < 207.206.15.108.1250 > 207.206.15.134.1723: .
3978705536:3978705536(0) ack 2538281226 win 17520 (DF)
12:51:59.709013 < 207.206.15.108.1250 > 207.206.15.134.1723: P 0:156(156)
ack 1 win 17520 (DF)
12:51:59.728378 < 207.206.15.108.1250 > 207.206.15.134.1723: P 156:324(168)
ack 157 win 17364 (DF)
12:51:59.755097 < 207.206.15.108.1250 > 207.206.15.134.1723: P 324:348(24)
ack 189 win 17332 (DF)
12:51:59.761680 < gre-proto-0x880B (gre encap)
12:51:59.901262 < gre-proto-0x880B (gre encap)
12:51:59.903728 < gre-proto-0x880B (gre encap)
12:52:01.773344 < gre-proto-0x880B (gre encap)
12:52:01.778422 < gre-proto-0x880B (gre encap)
12:52:01.781168 < 207.206.15.108.1250 > 207.206.15.134.1723: P 348:372(24)
ack 189 win 17332 (DF)
12:52:01.784329 < gre-proto-0x880B (gre encap)
12:52:01.785509 < gre-proto-0x880B (gre encap)
12:52:01.785592 < gre-proto-0x880B (gre encap)
12:52:01.785683 < gre-proto-0x880B (gre encap)
12:52:01.790427 < gre-proto-0x880B (gre encap)
12:52:01.795926 < 207.206.15.108.1250 > 207.206.15.134.1723: P 372:396(24)
ack 189 win 17332 (DF)
12:52:01.816616 < 207.206.15.108.1250 > 207.206.15.134.1723: P 396:412(16)
ack 189 win 17332 (DF)
12:52:01.872274 < 207.206.15.108.1250 > 207.206.15.134.1723: P 412:428(16)
ack 337 win 17184 (DF)