720 error : MPPE problem ?

Hi,

I try to setup a PPTP server, which uses MSCHAP-V2, with MPPE-128.

A windows client which tries to connect has the windows error 720 (I don't have
the text in english, but in french it's : "Une connexion à l’ordinateur distant
n’a pas pu être établie. Il peut être nécessaire de modifier les paramètres
réseau de cette connexion.")

My logs : 
Apr 18 21:42:34 flash pptpd[12764]: CTRL: Client 172.17.136.195 control
connection started
Apr 18 21:42:34 flash pptpd[12764]: CTRL: Starting call (launching pppd, opening GRE)
Apr 18 21:42:34 flash pppd[12765]: Plugin radius.so loaded.
Apr 18 21:42:34 flash pppd[12765]: RADIUS plugin initialized.
Apr 18 21:42:34 flash pppd[12765]: Plugin radattr.so loaded.
Apr 18 21:42:34 flash pppd[12765]: RADATTR plugin initialized.
Apr 18 21:42:34 flash pppd[12765]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Apr 18 21:42:34 flash pppd[12765]: pptpd-logwtmp: $Version$
Apr 18 21:42:34 flash pppd[12765]: pppd 2.4.5 started by root, uid 0
Apr 18 21:42:34 flash pppd[12765]: using channel 11
Apr 18 21:42:34 flash pppd[12765]: Using interface ppp0
Apr 18 21:42:34 flash pppd[12765]: Connect: ppp0 <--> /dev/pts/1
Apr 18 21:42:34 flash pppd[12765]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth
chap MS-v2> <magic 0xc74c068a> <pcomp> <accomp>]
Apr 18 21:42:34 flash pptpd[12764]: GRE: Bad checksum from pppd.
Apr 18 21:42:34 flash pppd[12765]: rcvd [LCP ConfReq id=0x0 <mru 1400> <magic
0x45a05495> <pcomp> <accomp> <callback CBCP>]
Apr 18 21:42:34 flash pppd[12765]: sent [LCP ConfRej id=0x0 <callback CBCP>]
Apr 18 21:42:34 flash pppd[12765]: rcvd [LCP ConfReq id=0x1 <mru 1400> <magic
0x45a05495> <pcomp> <accomp>]
Apr 18 21:42:34 flash pppd[12765]: sent [LCP ConfAck id=0x1 <mru 1400> <magic
0x45a05495> <pcomp> <accomp>]
Apr 18 21:42:37 flash pppd[12765]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth
chap MS-v2> <magic 0xc74c068a> <pcomp> <accomp>]
Apr 18 21:42:37 flash pptpd[12764]: CTRL: Ignored a SET LINK INFO packet with
real ACCMs!
Apr 18 21:42:37 flash pppd[12765]: rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <auth
chap MS-v2> <magic 0xc74c068a> <pcomp> <accomp>]
Apr 18 21:42:37 flash pppd[12765]: sent [LCP EchoReq id=0x0 magic=0xc74c068a]
Apr 18 21:42:37 flash pppd[12765]: sent [CHAP Challenge id=0x25
<8f04d20503d01d99d7bcc8c9d6fe94b5>, name = "pptpd"]
Apr 18 21:42:37 flash pppd[12765]: rcvd [LCP Ident id=0x2 magic=0x45a05495
"MSRASV5.20"]
Apr 18 21:42:37 flash pppd[12765]: rcvd [LCP Ident id=0x3 magic=0x45a05495
"MSRAS-0-KAD-PC"]
Apr 18 21:42:37 flash pppd[12765]: rcvd [LCP Ident id=0x4 magic=0x45a05495
"\37777777717H\022\37777777752\377777777324PE\37777777645_\37777777725#\37777777675\37777777611\37777777774/"]
Apr 18 21:42:37 flash pppd[12765]: rcvd [LCP EchoRep id=0x0 magic=0x45a05495]
Apr 18 21:42:37 flash pppd[12765]: rcvd [CHAP Response id=0x25
<ca4daa4b95308040b952cdaba266a53d0000000000000000593a23a3892974b508b7d7780b7e60ba8f775a93146a404700>,
name = "toto"]
Apr 18 21:42:37 flash pppd[12765]: RADATTR plugin wrote 7 line(s) to file
/var/run/radattr.ppp0.
Apr 18 21:42:37 flash pppd[12765]: sent [CHAP Success id=0x25
"S=4722D3F0FC9B8049ACEFA164D1338BF21573C74A"]
Apr 18 21:42:37 flash pppd[12765]: sent [CCP ConfReq id=0x1 <mppe +H -M +S -L -D -C>]
Apr 18 21:42:37 flash pppd[12765]: rcvd [IPV6CP ConfReq id=0x5 <addr
fe80::c8d1:e47e:105b:fbc2>]
Apr 18 21:42:37 flash pppd[12765]: Unsupported protocol 'IPv6 Control Protocol'
(0x8057) received
Apr 18 21:42:37 flash pppd[12765]: sent [LCP ProtRej id=0x2 80 57 01 05 00 0e 01
0a c8 d1 e4 7e 10 5b fb c2]
Apr 18 21:42:37 flash pppd[12765]: rcvd [CCP ConfReq id=0x6 <mppe +H -M +S -L -D -C>]
Apr 18 21:42:37 flash pppd[12765]: sent [CCP ConfAck id=0x6 <mppe +H -M +S -L -D -C>]
Apr 18 21:42:37 flash pppd[12765]: rcvd [IPCP ConfReq id=0x7 <addr 0.0.0.0>
<ms-dns1 0.0.0.0> <ms-wins 0.0.0.0> <ms-dns2 0.0.0.0> <ms-wins 0.0.0.0>]
Apr 18 21:42:37 flash pppd[12765]: sent [IPCP TermAck id=0x7]
Apr 18 21:42:37 flash pppd[12765]: rcvd [CCP ConfAck id=0x1 <mppe +H -M +S -L -D -C>]
Apr 18 21:42:37 flash pppd[12765]: MPPE 128-bit stateless compression enabled
Apr 18 21:42:37 flash pppd[12765]: sent [IPCP ConfReq id=0x1 <compress VJ 0f 01>
<addr 0.0.0.0>]
Apr 18 21:42:37 flash pppd[12765]: rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01>
<addr 0.0.0.0>]
Apr 18 21:42:37 flash pppd[12765]: sent [IPCP ConfReq id=0x2 <addrs 0.0.0.0 0.0.0.0>]
Apr 18 21:42:37 flash pppd[12765]: rcvd [IPCP ConfRej id=0x2 <addrs 0.0.0.0 0.0.0.0>]
Apr 18 21:42:37 flash pppd[12765]: sent [IPCP ConfReq id=0x3]
Apr 18 21:42:37 flash pppd[12765]: rcvd [IPCP ConfAck id=0x3]
Apr 18 21:42:39 flash pppd[12765]: rcvd [IPCP ConfReq id=0x8 <addr 0.0.0.0>
<ms-dns1 0.0.0.0> <ms-wins 0.0.0.0> <ms-dns2 0.0.0.0> <ms-wins 0.0.0.0>]
Apr 18 21:42:39 flash pppd[12765]: sent [IPCP ConfRej id=0x8 <addr 0.0.0.0>
<ms-dns1 0.0.0.0> <ms-wins 0.0.0.0> <ms-dns2 0.0.0.0> <ms-wins 0.0.0.0>]
Apr 18 21:42:39 flash pppd[12765]: rcvd [IPCP ConfReq id=0x9 <addr 0.0.0.0>]
Apr 18 21:42:39 flash pppd[12765]: sent [IPCP ConfRej id=0x9 <addr 0.0.0.0>]
Apr 18 21:42:39 flash pppd[12765]: rcvd [IPCP TermReq id=0xa
"E\37777777640T\37777777625\000<\37777777715t\000\000\002\37777777742"]
Apr 18 21:42:39 flash pppd[12765]: sent [IPCP TermAck id=0xa]
Apr 18 21:42:39 flash pppd[12765]: rcvd [LCP TermReq id=0xb
"E\37777777640T\37777777625\000<\37777777715t\000\000\000\000"]
Apr 18 21:42:39 flash pppd[12765]: LCP terminated by peer (EM- TM-^U^@<M-Mt^@^@^@^@)
Apr 18 21:42:39 flash pppd[12765]: sent [LCP TermAck id=0xb]
Apr 18 21:42:39 flash pppd[12765]: Modem hangup
Apr 18 21:42:39 flash pppd[12765]: Connection terminated.
Apr 18 21:42:39 flash pptpd[12764]: CTRL: Reaping child PPP[12765]
Apr 18 21:42:39 flash pppd[12765]: Connect time 0.1 minutes.
Apr 18 21:42:39 flash pppd[12765]: Sent 106 bytes, received 162 bytes.
Apr 18 21:42:39 flash pppd[12765]: RADATTR plugin removed file /var/run/radattr.ppp0.
Apr 18 21:42:39 flash pppd[12765]: Exit.
Apr 18 21:42:39 flash pptpd[12764]: CTRL: Client 172.17.136.195 control
connection finished

So I wonder if "MPPE 128-bit stateless compression enabled" and " GRE: Bad
checksum from pppd." are normal.

Oh, I must precise that the IP of client before and after connect is on the same
subnet than the PPTP server, (172.17.x.x).

Has anyone an idea of the problem ?
Thanks,
Gregoire Leroy


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