Can't connect to Web socket, connection refused Unity WebGL

Hello,

I am porting one of my old game to WebGL in unity. But the thing is that when i build and run the project it starts shows a glimpse and crashes. When i checked the console (chrome javascript console) there was an error saying Connection to web socket refused, request returned with err_connection_refused. I've enabled web socket flags in chrome but no help. can you guide me whats the thing that i should do to get my project running.

Some threads suggests that i should check the converted files (from c# to js) in build folder but i can't find .js files either they are .jsgz. So please help me out on this.