How to make l2tp vpn client work on Linux Mint?

I set up a vpn connection according to this instruction - https://www.rapidvpn.com/setup-vpn-l2tp-mint I establish a vpn connection to my server. The connection is established, but the pings do not go, the pages on the Internet do not open, there is no access to the local network behind the server. As if there are problems with packet routing after I receive the configuration via dhcp from a remote server. After about 60 seconds, the connection is broken. I’ll make a reservation right away, such a connection to the same server from under Windows or MacOS works without problems. I tried to change the connection to the Internet. The problem is not with the ISP. Replaced the xl2tpd plugin in the network manager with kl2tpd. The problem doesn't go away. Before reinstalling Linux, the vpn client worked. What is configured wrong on Linux Mint? Logs from the client are attached Apr 15 20:31:30 LenovoPC charon: 13[IKE] local host is behind NAT, sending keep alives Apr 15 20:31:30 LenovoPC charon: 14[IKE] IKE_SA 955a0158-8008-45b4-b61b-aae634aad51b established between 192.168.1.100[192.168.1.100]...80.80.33.101[80.80.33.101] Apr 15 20:31:30 LenovoPC charon: 15[IKE] CHILD_SA 955a0158-8008-45b4-b61b-aae634aad51b{1} established with SPIs c82f58b7_i ca6daee4_o and TS 192.168.1.100/32[udp/l2f] === 80.80.33.101/32[udp/l2f] Apr 15 20:31:30 LenovoPC nm-l2tp-service: strongSwan IPsec connection is up. Apr 15 20:31:30 LenovoPC pppd: Using interface ppp0 Apr 15 20:31:30 LenovoPC pppd: Connect: ppp0 Apr 15 20:31:30 LenovoPC pppd: Overriding mtu 1500 to 1400 Apr 15 20:31:30 LenovoPC pppd: Overriding mru 1500 to mtu value 1400 Apr 15 20:32:12 LenovoPC pppd: CHAP authentication succeeded Apr 15 20:32:12 LenovoPC charon: 07[KNL] 10.100.20.1 appeared on ppp0 Apr 15 20:32:12 LenovoPC charon: 09[KNL] interface ppp0 activated pr 15 20:32:12 LenovoPC pppd: local IP address 10.100.20.1 Apr 15 20:32:12 LenovoPC pppd: remote IP address 80.80.33.101 Apr 15 20:32:12 LenovoPC NetworkManager: [1681583532.4651] device (ppp0): state change: unmanaged -> unavailable (reason 'connection-assumed', sys-iface-state: 'external') Apr 15 20:32:12 LenovoPC pppd: primary DNS address 1.1.1.1 Apr 15 20:32:12 LenovoPC pppd: secondary DNS address 8.8.8.8 Apr 15 20:32:12 LenovoPC NetworkManager: [1681583532.4662] device (ppp0): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'external') Apr 15 20:32:12 LenovoPC dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.16' (uid=0 pid=917 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined") Apr 15 20:32:12 LenovoPC NetworkManager: [1681583532.4861] policy: set 'VPN' (ppp0) as default for IPv4 routing and DNS Apr 15 20:32:12 LenovoPC systemd-resolved: wlp3s0: Bus client set default route setting: no Apr 15 20:32:12 LenovoPC systemd-resolved: wlp3s0: Bus client reset DNS server list. Apr 15 20:32:12 LenovoPC systemd-resolved: ppp0: Bus client set default route setting: yes Apr 15 20:32:12 LenovoPC systemd-resolved: ppp0: Bus client set DNS server list to: 1.1.1.1, 8.8.8.8 Apr 15 20:32:12 LenovoPC nm-dispatcher: /etc/network/if-up.d/resolved: 12: mystatedir: not found Apr 15 20:32:28 LenovoPC systemd-resolved: Using degraded feature set UDP instead of UDP+EDNS0 for DNS server 8.8.8.8. Apr 15 20:32:33 LenovoPC systemd-resolved: Using degraded feature set UDP instead of UDP+EDNS0 for DNS server 1.1.1.1. Apr 15 20:33:10 LenovoPC NetworkManager: xl2tpd: check_control: Received out of order control packet on tunnel 56426 (got 2, expected 3) Apr 15 20:33:10 LenovoPC NetworkManager: xl2tpd: handle_control: bad control packet! Apr 15 20:33:12 LenovoPC NetworkManager: xl2tpd: check_control: Received out of order control packet on tunnel 56426 (got 2, expected 3) Apr 15 20:33:12 LenovoPC NetworkManager: xl2tpd: handle_control: bad control packet! Apr 15 20:33:16 LenovoPC NetworkManager: xl2tpd: check_control: Received out of order control packet on tunnel 56426 (got 2, expected 3) Apr 15 20:33:16 LenovoPC NetworkManager: xl2tpd: handle_control: bad control packet! Apr 15 20:33:40 LenovoPC NetworkManager: xl2tpd: Maximum retries exceeded for tunnel 4711. Closing. Apr 15 20:33:40 LenovoPC NetworkManager: xl2tpd: Terminating pppd: sending TERM signal to pid 10628 Apr 15 20:33:40 LenovoPC NetworkManager: xl2tpd: Connection 56426 closed to 80.80.33.101, port 1701 (Timeout) Apr 15 20:33:40 LenovoPC pppd: Terminating on signal 15 Apr 15 20:33:40 LenovoPC pppd: Connect time 1.5 minutes.