[Erc-discuss] Why I cannot connect to freenode irc server?

[Misskiss]

Dear all,
When I use M-x erc, I got the following error, can anyone please help?

Debugger entered--Lisp error: (file-error "make client process failed" 
"connection refused" :name "erc-irc.freenode.net-6667" :buffer nil :host 
"irc.freenode.net" :service 6667)
  make-network-process(:name "erc-irc.freenode.net-6667" :buffer nil :host 
"irc.freenode.net" :service 6667)
  open-network-stream("erc-irc.freenode.net-6667" nil "irc.freenode.net" 6667)
  erc-server-connect("irc.freenode.net" 6667 #<buffer irc.freenode.net:6667>)
  erc-open("irc.freenode.net" 6667 "misskiss" "unknown" t "family")
  erc(:server "irc.freenode.net" :port 6667 :nick "misskiss" :password "*****")
  call-interactively(erc t nil)
  execute-extended-command(nil)
  call-interactively(execute-extended-command nil nil)
  
-- 
Life is hard...