How to set up a VPN client correctly?

Question

VPN

I have my username and password. Created the following settings file:

nodetach
persist
maxfail 0
name "xxxx"
password "xxxx"
nodefaultroute
replacedefaultroute
remotename vpn1
pty "pptp xx.xx.xx.xx --nolaunchpppd"

I connect like this:
pon vpn1 debug dump logfd 2 nodetach
At the output:

using channel 120
Using interface ppp1
Connect: ppp1 <--> /dev/pts/30
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xf2dc2e87> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xf2dc2e87> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xf2dc2e87> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xf2dc2e87> <pcomp> <accomp>]
Script pptp xx.xx.xx.xx --nolaunchpppd finished (pid 7526), status = 0x0
Modem hangup
Connection terminated.
using channel 123
Using interface ppp1
Connect: ppp1 <--> /dev/pts/30
anon warn[open_unixsock:pptp_callmgr.c:348]: Call manager for  xx.xx.xx.xx is already running.
anon fatal[callmgr_main:pptp_callmgr.c:129]: Could not open unix socket for  xx.xx.xx.xx
anon fatal[open_callmgr:pptp.c:487]: Call manager exited with error 256
Script pptp  xx.xx.xx.xx  --nolaunchpppd finished (pid 7578), status = 0x1
Modem hangup
Connection terminated.
using channel 124
Using interface ppp1
Connect: ppp1 <--> /dev/pts/30
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x77f735a3> <pcomp> <accomp>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x77f735a3> <pcomp> <accomp>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x77f735a3> <pcomp> <accomp>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x77f735a3> <pcomp> <accomp>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x77f735a3> <pcomp> <accomp>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x77f735a3> <pcomp> <accomp>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x77f735a3> <pcomp> <accomp>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x77f735a3> <pcomp> <accomp>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x77f735a3> <pcomp> <accomp>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x77f735a3> <pcomp> <accomp>]
Script pptp  xx.xx.xx.xx --nolaunchpppd finished (pid 7605), status = 0x0
Modem hangup
Connection terminated.
using channel 127
Using interface ppp1
Connect: ppp1 <--> /dev/pts/30
anon warn[open_unixsock:pptp_callmgr.c:348]: Call manager for  xx.xx.xx.xx is already running.
anon fatal[callmgr_main:pptp_callmgr.c:129]: Could not open unix socket for  xx.xx.xx.xx
anon fatal[open_callmgr:pptp.c:487]: Call manager exited with error 256
Modem hangup
Connection terminated.
using channel 128
Using interface ppp1
Connect: ppp1 <--> /dev/pts/30
Script pptp  xx.xx.xx.xx --nolaunchpppd finished (pid 7651), status = 0x1
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf216a098> <pcomp> <accomp>]
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf216a098> <pcomp> <accomp>]
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf216a098> <pcomp> <accomp>]
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf216a098> <pcomp> <accomp>]
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf216a098> <pcomp> <accomp>]
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf216a098> <pcomp> <accomp>]
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf216a098> <pcomp> <accomp>]
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf216a098> <pcomp> <accomp>]
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf216a098> <pcomp> <accomp>]
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf216a098> <pcomp> <accomp>]
Script pptp  xx.xx.xx.xx --nolaunchpppd finished (pid 7679), status = 0x0
Modem hangup
Connection terminated.
using channel 130
Using interface ppp0
Connect: ppp0 <--> /dev/pts/5
sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x88ee5cdf> <pcomp> <accomp>]
sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x88ee5cdf> <pcomp> <accomp>]
sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x88ee5cdf> <pcomp> <accomp>]
sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x88ee5cdf> <pcomp> <accomp>]
sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x88ee5cdf> <pcomp> <accomp>]
sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x88ee5cdf> <pcomp> <accomp>]
sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x88ee5cdf> <pcomp> <accomp>]
sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x88ee5cdf> <pcomp> <accomp>]
sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x88ee5cdf> <pcomp> <accomp>]
..................................................................................................................................

As a result, there is no connection. The VPN server admin says he is responding to the request:

122901 sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MD5> <magic 0xf2cd7b01> <pcomp> <accomp>]

But the client does not receive it. Tell me what I'm doing wrong.

Answer 1

anon warn[open_unixsock:pptp_callmgr.c:348]: Call manager for  xx.xx.xx.xx is already running.
anon fatal[callmgr_main:pptp_callmgr.c:129]: Could not open unix socket for  xx.xx.xx.xx
anon fatal[open_callmgr:pptp.c:487]: Call manager exited with error 256

These lines tell you that the connection manager for this IP is already open. Accordingly, the socket file has already been created, and when a connection is established, a new socket cannot be created. Understand why the socket file exists and where it is located (using strace, for example).