That was the problem. I discovered that my ISP makes carrier-grade NAT and was behind another router, so my wan ip was different than my public ip. I rebooted my router and got a public address (luckily) and now it's working.
I use the DDNS provided by Asus. This is the log from my android phone :
22:56:26.347 -- Server poll timeout, trying next remote entry...
22:56:26.348 -- EVENT: RECONNECTING
22:56:26.352 -- EVENT: RESOLVE
22:56:26.360 -- Contacting 100.117.54.49:1194 via UDP
22:56:26.360 -- EVENT: WAIT...
Hello!
I have a RT-AX56U with Asuswrt Merlin Firmware Version:384.18 and I setup a OpenVpn server. I imported the certificate from server and the problem is the clients from Android or Windows 10 can't connect to the Openvpn server.
On ther server side on RT-AX56U:
Oct 28 21:34:34...