I am not sure but i am kind of confused why you are trying crs_stat and register your ASM and all things.

You are getting this error in EM "Agent is Unreachable (REASON = Connection refused) but the host is UP " I guess its main error as agent is the one who communicates with db collects all metrics and send it to repository. and EM reads data from repository and shows you in form of HTML.

Now check on second host if your agent is up or not. Do you installed agent with same oracle user or some other user login to that user and try "emctl status agent"