RUT955 L2TP/IPSEC client not connecting to Unifi Edgerouter VPN server

[raimo]

Hello everyone.

• I have L2TP/IPSec server running on Unifi Edgerouter on fixed IP
• I can successfuylly connect to this server from all my IPhones and Mac computers, except RUT955
• previously I also had a permanent VPN connection to this server from my RUT955 client
• Recently I had to do a factory reset and now I am not able to configure the VPN on my RUT955 again. I have already spent days trying different options. Iphone/Mac connects, RUT955 does not. I have cross-checket the IPs usernames, passwords 10 times by now.
  On IPhone I have to configure only 4 parameters and it works: server IP, account name, password and secret.

Please suggect what is wrong or what parameter changes should I try.

I am trying following options in RUT, but it just does not connect anymore:

[raimo]

[raimo]

[raimo]

[raimo]

I had a limitation of 1 screenshot per post, therefore sorry for several posts on this topic.

However, now all my VPN configuration should be well visible.

Please help, what is wrong there.

Thnaks in advance.

[raimo]

Adding here the configuration of the VPN server on the unifi Edgerouter
On server side I see active L2TP connection → it seems that my problem should be on IPSEC part.

vpn {
ipsec {
allow-access-to-local-interface disable
auto-firewall-nat-exclude disable
ipsec-interfaces {
interface eth0
}
nat-networks {
allowed-network 0.0.0.0/0 {
}
}
nat-traversal enable
}
l2tp {
remote-access {
authentication {
local-users {
username XXXXXXX {
password YYYYYYY
static-ip 192.168.1.X
}
}
mode local
}
client-ip-pool {
start 192.168.1.x
stop 192.168.1.x
}
dhcp-interface eth0
dns-servers {
server-1 8.8.8.8
server-2 8.8.4.4
}
idle 1800
ipsec-settings {
authentication {
mode pre-shared-secret
pre-shared-secret ZZZZZZZZZ
}
ike-lifetime 3600
lifetime 3600
}
mtu 1492
}
}
}