The RUT log message is:
"daemon.err openvpn(client_teltonika)[15169]: Linux ifconfig failed: external program exited with error status: 1"
..and the tun interface, obviously, not up.
Client config (RUT)
======================================================
client
nobind
persist-key
auth sha1
ca /lib/uci/upload/cbid.openvpn.client_teltonika.ca
cert /lib/uci/upload/cbid.openvpn.client_teltonika.cert
cipher AES-128-CBC
dev tun_c_teltonika
keepalive 10 120
key /lib/uci/upload/cbid.openvpn.client_teltonika.key
port 1194
proto tcp-client
remote 83.211.XXX.YYY
resolv-retry infinite
verb 5
auth-nocache
script-security 2
down /etc/openvpn/updown_dns
up /etc/openvpn/updown_dns
=======================================================
Server config (Centos 8 openvpn)
=======================================================
port 1194
proto tcp-server
dev tun0
ca keys/holisticlab_ca/ca.crt
cert keys/holisticlab_ca/holisticlab_maincert.crt
key keys/holisticlab_ca/holisticlab_maincert.key
dh keys/holisticlab_ca/dh2048.pem
topology subnet
server 172.16.20.0 255.255.254.0
crl-verify keys/holisticlab_ca/crl.pem
cipher AES-128-CBC
user nobody
group adm
status servers/holisticLab_CertKey_TCP/logs/openvpn-status.log
log-append servers/holisticLab_CertKey_TCP/logs/openvpn.log
verb 3
mute 20
max-clients 300
# tun-mtu 1500
# mssfix 1450
local keys.holisticlab.it
management 127.0.0.1 30000
keepalive 10 120
client-config-dir /etc/openvpn/servers/holisticLab_CertKey_TCP/ccd
# comp-lzo
persist-key
persist-tun
ccd-exclusive
#
route 192.168.190.0 255.255.255.240
=========================================================
Can you hel me ?!?
Thanks in advance