I was success to setup webstomp plugin/ websocket in Rabbitmq on a server, I check all listeners using command :
rabbitmq-diagnostics listeners
and here was the output :
Interface: [::], port: 15672, protocol: http, purpose: HTTP API
Interface: [::], port: 61613, protocol: stomp, purpose: STOMP
Interface: [::], port: 15674, protocol: http/web-stomp, purpose: STOMP over WebSockets
Interface: [::], port: 15673, protocol: https/web-stomp, purpose: STOMP over WebSockets and TLS (HTTPS)
Interface: [::], port: 25672, protocol: clustering, purpose: inter-node and CLI tool communication
Interface: [::], port: 5672, protocol: amqp, purpose: AMQP 0-9-1 and AMQP 1.0
Interface: [::], port: 5671, protocol: amqp/ssl, purpose: AMQP 0-9-1 and AMQP 1.0 over TLS
then I test the connection using wscat within command :
wscat -c ws://st***re.com:15674/ws
and got success response (connected) :
Connected (press CTRL+C to quit)
The issue when tryin to connect using wss (ssl) :
wscat -c wss://st***re.com:15673/ws
it failed to connect :
error: Client network socket disconnected before secure TLS connection was established
I dont have idea, what was wrong, probably someone can help ?
here is the rabbitmq.comf :
listeners.ssl.default = 5671
ssl_options.cacertfile = ca_certificate.pem
ssl_options.certfile = server_certificate.pem
ssl_options.keyfile = server_key.pem
web_stomp.ssl.port = 15673
web_stomp.ssl.backlog = 1024
web_stomp.ssl.certfile = server_certificate.pem
web_stomp.ssl.keyfile = server_key.pem
web_stomp.ssl.cacertfile = ca_certificate.pem
web_stomp.ssl.password = bunnies
question from:
https://stackoverflow.com/questions/65645937/cant-connect-to-wss-ssl-rabbitmq-web-stomp 
