Cipher suite used by the local server

Hello all, I am new here and trying to figure out how to change the local server cipher suite. Help would be greatly appreciated.

I think I am getting close. I narrowed down the java code responsible for the ssl: under server>core>src>main>java>cc>blynk>server. Does anyone know how to apply sslSuiteFilter for sslContextBuilder.forSever?

The issue of the Cipher suite has been resolved.