ipsec.conf
version 2.0
config setup
conn L2TP-PSK
authby=secret
pfs=no
auto=add
rekey=no
left=%defaultroute
type=transport
leftprotoport=17/1701
rightprotoport=17/1701
dpddelay=15
dpdtimeout=30
dpdaction=clear
ike=3des-sha1;modp1024
# set this to the ip address of your vpn server:
right=$VPN_SERVER_IPV4][1]
[1]: https://i.stack.imgur.com/r3h1m.jpg What should I do to solve the problem?