[pptp-devel] VPN PPTP connection error

[* <zh...@gm...>]

Hi,

I am trying to connect to work's VPN on PPTP. My work uses Draytek VPN. I
am using macOS High Sierra pppd version 2.4.2

I think VPN server accepts my username and password. But I get MS-CHAPv2
Success packet is badly formed.

I don't understand what is happening.

Any help will be appreciated.

Jake He

Here is my configure

➜  ~ cat /etc/ppp/peers/vpnwork
plugin PPTP.ppp
noauth
#logfile /tmp/ppp.log
remoteaddress "110.x.x.98"
user workdomain\\myusername
password something
redialcount 1
redialtimer 5
idle 1800
# mru 1368
# mtu 1368
receive-all
novj 0:0
ipcp-accept-local
ipcp-accept-remote
noauth
nobsdcomp
#nodeflate
refuse-eap
refuse-pap
refuse-mschap
refuse-chap
hide-password
#mppe-stateless
#require-mschap-v2
mppe-128
require-mppe-128
looplocal
nodetach
# ms-dns 8.8.8.8
usepeerdns
#ipparam
defaultroute
debug


Here is the log

➜  ~ sudo pppd call vpnwork
Thu Dec 21 08:40:36 2017 : publish_entry SCDSet() failed: Success!
Thu Dec 21 08:40:36 2017 : publish_entry SCDSet() failed: Success!
Thu Dec 21 08:40:36 2017 : PPTP connecting to server '110.x.x.98'
  (110.x.x.98)...
Thu Dec 21 08:40:36 2017 : PPTP connection established.
Thu Dec 21 08:40:36 2017 : PPTP set port-mapping for en0, interface:
8,    protocol: 0, privatePort: 0
Thu Dec 21 08:40:36 2017 : using link 1
Thu Dec 21 08:40:36 2017 : Using interface ppp1
Thu Dec 21 08:40:36 2017 : Connect: ppp1 <--> socket[34:17]
Thu Dec 21 08:40:36 2017 : sent [LCP ConfReq id=0x1 <asyncmap 0x0>
<magic 0x38214622> <pcomp> <accomp>]
Thu Dec 21 08:40:36 2017 : rcvd [LCP ConfAck id=0x1 <asyncmap 0x0>
<magic 0x38214622> <pcomp> <accomp>]
Thu Dec 21 08:40:39 2017 : sent [LCP ConfReq id=0x1 <asyncmap 0x0>
<magic 0x38214622> <pcomp> <accomp>]
Thu Dec 21 08:40:39 2017 : rcvd [LCP ConfReq id=0x1 <asyncmap 0x0>
<auth chap MS-v2> <magic 0x178c4dd4> <pcomp> <accomp>]
Thu Dec 21 08:40:39 2017 : lcp_reqci: returning CONFACK.
Thu Dec 21 08:40:39 2017 : sent [LCP ConfAck id=0x1 <asyncmap 0x0>
<auth chap MS-v2> <magic 0x178c4dd4> <pcomp> <accomp>]
Thu Dec 21 08:40:39 2017 : rcvd [LCP ConfAck id=0x1 <asyncmap 0x0>
<magic 0x38214622> <pcomp> <accomp>]
Thu Dec 21 08:40:39 2017 : rcvd [LCP EchoReq id=0x0 magic=0x178c4dd4]
Thu Dec 21 08:40:39 2017 : sent [LCP EchoRep id=0x0 magic=0x38214622]
Thu Dec 21 08:40:39 2017 : rcvd [CHAP Challenge id=0x1
<3b1b5105149215be4074824c50c16eeb>, name = "Draytek"]
Thu Dec 21 08:40:39 2017 : sent [CHAP Response id=0x1
<fe5aad17a54a55819832957268cef98500000000000000004c3a2b98f53babccb4d02e7608d88cbd9693cae7023ebe1600>,
name = "workdomain\\myusername"]
Thu Dec 21 08:40:39 2017 : rcvd [CHAP Success id=0x1
"\001S=6FD1D958714C524CB910F77CA4A7D9803AFE5518"]
Thu Dec 21 08:40:39 2017 : MS-CHAPv2 Success packet is badly formed.
Thu Dec 21 08:40:39 2017 : sent [LCP TermReq id=0x2 "Failed to
authenticate ourselves to peer"]
Thu Dec 21 08:40:39 2017 : Connection terminated.
Thu Dec 21 08:40:39 2017 : PPTP disconnecting...
Thu Dec 21 08:40:39 2017 : PPTP clearing port-mapping for en0
Thu Dec 21 08:40:39 2017 : PPTP disconnected