Debug XRay VLESS VPN Setup

I’ve built a personal VPN on a Linux VPS with XRay-core, VLESS + Reality transport, all managed through 3x-ui. The installation finished without errors, and the service reports as running, yet my V2Ray client never gets a response from the server—it just sits there until it times out. What I need from you: dig into the current configuration, spot whatever is blocking the handshake, and leave me with a working tunnel I can reach from a V2Ray client. If you’re fluent with XRay/VLESS/Reality on Linux and comfortable tracing connection flows, packet filters, and SNI rules, this should be straightforward.