Help 
I have setup a pptp server (nevermind security or lack there of) and can easily connect from my laptop (and I enabled passthrough), but it doesn't work once I try to install the pptp client on the router.
Looks like the exchange of the 'Configuration Request' goes wrong.
logread
Thu Mar 1 01:00:58 2018 daemon.notice netifd: Interface 'pptp_vpn' is now down
Thu Mar 1 01:00:58 2018 daemon.notice netifd: Interface 'pptp_vpn' is setting up now
Thu Mar 1 01:00:59 2018 daemon.info pppd[10649]: Plugin pptp.so loaded.
Thu Mar 1 01:00:59 2018 daemon.info pppd[10649]: PPTP plugin version 1.00
Thu Mar 1 01:00:59 2018 daemon.notice pppd[10649]: pppd 2.4.7 started by root, uid 0
Thu Mar 1 01:00:59 2018 daemon.debug pppd[10650]: pptp: call manager for 5.150.254.167
Thu Mar 1 01:00:59 2018 daemon.debug pppd[10650]: window size: 50
Thu Mar 1 01:00:59 2018 daemon.debug pppd[10650]: call id: 40
Thu Mar 1 01:00:59 2018 daemon.debug pppd[10650]: control connection
Thu Mar 1 01:00:59 2018 daemon.debug pppd[10650]: unix_sock
Thu Mar 1 01:00:59 2018 daemon.debug pppd[10651]: Sent control packet type is 1 'Start-Control-Connection-Request'
Thu Mar 1 01:00:59 2018 daemon.debug pppd[10651]: Received Start Control Connection Reply
Thu Mar 1 01:00:59 2018 daemon.debug pppd[10651]: Client connection established.
Thu Mar 1 01:00:59 2018 daemon.warn odhcpd[1013]: A default route is present but there is no public prefix on br-lan thus we don't announce a default route!
Thu Mar 1 01:01:00 2018 daemon.debug pppd[10651]: Sent control packet type is 7 'Outgoing-Call-Request'
Thu Mar 1 01:01:00 2018 daemon.debug pppd[10651]: Received Outgoing Call Reply.
Thu Mar 1 01:01:00 2018 daemon.debug pppd[10651]: Outgoing call established (call ID 40, peer's call ID 11008).
Thu Mar 1 01:01:00 2018 daemon.debug pppd[10649]: using channel 40
Thu Mar 1 01:01:00 2018 kern.info kernel: [ 3660.630565] pptp-pptp_vpn: renamed from ppp0
Thu Mar 1 01:01:00 2018 daemon.info pppd[10649]: Using interface pptp-pptp_vpn
Thu Mar 1 01:01:00 2018 daemon.notice pppd[10649]: Connect: pptp-pptp_vpn <--> pptp (5.150.254.167)
Thu Mar 1 01:01:00 2018 daemon.debug pppd[10649]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x48e29e1d>]
Thu Mar 1 01:01:01 2018 daemon.info dnsmasq[1806]: read /etc/hosts - 4 addresses
Thu Mar 1 01:01:01 2018 daemon.info dnsmasq[1806]: read /tmp/hosts/dhcp.cfg01411c - 2 addresses
Thu Mar 1 01:01:01 2018 daemon.info dnsmasq-dhcp[1806]: read /etc/ethers - 0 addresses
Thu Mar 1 01:01:03 2018 daemon.debug pppd[10649]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x48e29e1d>]
Thu Mar 1 01:01:06 2018 daemon.debug pppd[10649]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x48e29e1d>]
Thu Mar 1 01:01:09 2018 daemon.debug pppd[10649]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x48e29e1d>]
Thu Mar 1 01:01:12 2018 daemon.debug pppd[10649]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x48e29e1d>]
Thu Mar 1 01:01:15 2018 daemon.debug pppd[10649]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x48e29e1d>]
Thu Mar 1 01:01:18 2018 daemon.debug pppd[10649]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x48e29e1d>]
Thu Mar 1 01:01:21 2018 daemon.debug pppd[10649]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x48e29e1d>]
Thu Mar 1 01:01:24 2018 daemon.debug pppd[10649]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x48e29e1d>]
Thu Mar 1 01:01:27 2018 daemon.debug pppd[10649]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x48e29e1d>]
Thu Mar 1 01:01:30 2018 daemon.warn pppd[10651]: read returned zero, peer has closed
Thu Mar 1 01:01:30 2018 daemon.debug pppd[10651]: Closing connection (shutdown)
Thu Mar 1 01:01:30 2018 daemon.debug pppd[10651]: Sent control packet type is 12 'Call-Clear-Request'
Thu Mar 1 01:01:30 2018 daemon.warn pppd[10651]: read returned zero, peer has closed
Thu Mar 1 01:01:30 2018 daemon.debug pppd[10651]: Closing connection (call state)
Thu Mar 1 01:01:30 2018 daemon.warn pppd[10649]: LCP: timeout sending Config-Requests
Thu Mar 1 01:01:30 2018 daemon.notice pppd[10649]: Connection terminated.
Thu Mar 1 01:01:30 2018 daemon.notice pppd[10649]: Modem hangup
Thu Mar 1 01:01:30 2018 daemon.info pppd[10649]: Exit.
WireShark
3037 -14.601887 5.150.254.167 192.168.2.108 PPP LCP 74 Configuration Request
3038 -14.556805 192.168.2.108 5.150.254.167 PPP LCP 70 Configuration Request
3039 -14.532859 5.150.254.167 192.168.2.108 PPP LCP 74 Configuration Ack
3072 -11.584103 5.150.254.167 192.168.2.108 TCP 66 1723 → 32868 [FIN, ACK] Seq=189 Ack=325 Win=31104 Len=0 TSval=28658490 TSecr=258989
3073 -11.583650 192.168.2.108 5.150.254.167 PPTP 82 Call-Clear-Request
3074 -11.583238 192.168.2.108 5.150.254.167 TCP 66 32868 → 1723 [FIN, ACK] Seq=341 Ack=190 Win=30272 Len=0 TSval=261995 TSecr=28658490
3075 -11.558837 5.150.254.167 192.168.2.108 TCP 60 1723 → 32868 [RST] Seq=190 Win=0 Len=0
3076 -11.558817 5.150.254.167 192.168.2.108 TCP 60 1723 → 32868 [RST] Seq=190 Win=0 Len=0
/etc/ppp/options
debug
logfile /dev/null
noipdefault
noaccomp
nopcomp
nocrtscts
lock
maxfail 0
lcp-echo-failure 5
lcp-echo-interval 1
#silent
/etc/ppp/options.pptp
noipdefault
noauth
nobsdcomp
nodeflate
idle 0
mppe required,stateless
maxfail 0
SERVER CONF
/etc/ppp/pptpd-options
name pptpd
#refuse-pap
#refuse-chap
#refuse-mschap
#refuse-eap
require-mppe-128
ms-dns 8.8.8.8
ms-dns 8.8.4.4
proxyarp
nodefaultroute
lock
nobsdcomp
nologfd
/etc/ppp/options
debug
logfile /dev/null
noipdefault
noaccomp
nopcomp
nocrtscts
lock
maxfail 0
lcp-echo-failure 5
lcp-echo-interval 1
#silent
Any hint as to where / how to fix this?