• Added support for TCP Transport mode (TCPT) for IPSec tunnels. It can be selected by two options: ike-transport=tcpt and esp-transport=tcpt. Use the first option only if you encounter the "failed to fill whole buffer" error. Use the second option only if you encounter the "Probing failed, server is not reachable via ESPinUDP tunnel" error.
• Added a workaround to attempt to unblock IPSec port 4500 in some cases.
• Implemented a sign-out call after tunnel disconnection.
• Resolved a compatibility issue with OpenSSL 1.x when building on older hosts.