No close event in crypted mode (TLS)

[Igi54]

Hello, I use IXWebSocket 11.4.3. for both - clients and a server. When I use unsecured connection (ws:) everything works perfectly- when I turn off the server, a clients notice it and say "unable to connect.." when I turn on the server the clients connect again automaticaly. But if I use TLS (wss:) with all needed certificates, I can connect clients to server, I can send messages, but the detection if the server is connected fails. It means when I turn off the server clients say nothing and when ping message should be sent from a client, the client crashes. I use Linux for both - clients and server. Thank you in advance for any help.