Regular client works, web client doesn't - websocket connection to port 21118 is being reset

[mdmitry]

After putting my hbbs/hbbr IP and public key into the regular RustDesk client the connection works flawlessly, however after doing the same with a web client it immediately shows "Connection error: Failed to connect to rendezvous server, wss://192.168.1.3:21118"

Firefox developer tools show NS_ERROR_NET_RESET
Chrome/Edge developer tools show no useful information, not even request headers or error code
Wireshark shows that client (web browser) sends TLS 1.2 Client Hello (1867 bytes), the server (hbbs) first ACKnowledges these bytes, and then sends FIN+ACK (gracefully closing the connection) without sending any data back.

Opening https://192.168.1.3:21118/ in Firefox shows PR_END_OF_FILE_ERROR
Opening https://192.168.1.3:21118/ in Chrome shows ERR_CONNECTION_CLOSED

I have a simple Windows 10 installation of hbbs/hbbr v1.1.14 - extracted and installed as a service with nssm.
Doesn't matter whether hbbs is run as a service, or from cmd.
If run from cmd no errors are shown, and hbbs continues to run.
Doesn't matter whether I enter local or global IP into the web client. (all ports are forwarded properly)

This is how hbbs output looks when run from cmd:

`[2025-08-05 01:57:49.040003 +03:00] INFO [src\common.rs:121] Private key comes from id_ed25519

[2025-08-05 01:57:49.040042 +03:00] INFO [src\rendezvous_server.rs:1205] Key: REMOVED

[2025-08-05 01:57:49.042232 +03:00] INFO [src\peer.rs:84] DB_URL=C:\Users\i\AppData\Roaming\RustDesk\config\db_v2.sqlite3

[2025-08-05 01:57:49.048177 +03:00] INFO [src\rendezvous_server.rs:99] serial=0

[2025-08-05 01:57:49.048184 +03:00] INFO [src\common.rs:45] rendezvous-servers=[]

[2025-08-05 01:57:49.048186 +03:00] INFO [src\rendezvous_server.rs:101] Listening on tcp/udp :21116

[2025-08-05 01:57:49.048187 +03:00] INFO [src\rendezvous_server.rs:102] Listening on tcp :21115, extra port for NAT test

[2025-08-05 01:57:49.048188 +03:00] INFO [src\rendezvous_server.rs:103] Listening on websocket :21118

[2025-08-05 01:57:49.049533 +03:00] INFO [src\rendezvous_server.rs:138] mask: None

[2025-08-05 01:57:49.049535 +03:00] INFO [src\rendezvous_server.rs:139] local-ip: ""

[2025-08-05 01:57:49.049548 +03:00] INFO [src\common.rs:45] relay-servers=[]

[2025-08-05 01:57:49.049681 +03:00] INFO [src\rendezvous_server.rs:153] ALWAYS_USE_RELAY=N

[2025-08-05 01:57:49.049694 +03:00] INFO [src\rendezvous_server.rs:185] Start`