colucci-web.it

Probably the NAT used on the client side and/or on the server side is not compatible with SoftEther NAT-T.
This link describes the method used to establish the connection and why it doesn't work with some NAT types:
https://en.wikipedia.org/wiki/UDP_hole_punching

Have you updated the app to last version 1.01.30?

To use UPD NAT-T protocol the remote server must be a hostname in softether.net domain like xxx.softether.net

• OpenSSL library 3.0.8/1.1.1t

• (SoftEther) RUDP fixes/improvements

• Minor improvements/bug fixes

UDP over DNS and NAT-T has been added in the new version 1.01.29.
Please, update the app and check the "Remote servers" section.

• (SoftEther) UDP Over DNS / NAT-T

• Fix: crash for KeyPermanentlyInvalidatedException in biometric authentication

• Minor improvements/bug fixes

2023-01-24 14:24:43 TCP: connect to [AF_INET]73.12.x.x:12973 failed: Connection refused This error means that the connection was rejected by the remote host. This usually happens when the VPN server is not running or listening on another port or a firewall is rejecting TCP-SYN packets. I'm sorry bu...

Android can use PIA VPN without issue. Probably this VPN uses another port and/or the TCP protocol. Router logs don't show the android trying to connect. This means that packets sent by the client are blocked. I'm thinking an issue with TUN? If the TUN/TAP configuration does not match the VPN conne...

2023-01-22 18:45:43 TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity) This error means that the client receives no response from the server. So sent and/or received packets are lost. This usually happens when there is a firewall between the client an...