ssh - X11 forwarding request failed to my OS X machine -

i not understand keeping me making x11 tunnel mac @ home, running os x 10.10.2. i'm getting (hostnames redacted privacy):

cook47@rcmac (~ ): ssh -y mymac x11 forwarding request failed last login: thu apr  9 11:12:13 2015 xxx.xxx.xxx 

in sshd_config have set x11forwarding yes, , tried crank debugging loglevel debug3 don't see in system log. also, tried restarting x11.app no changes. suggestions on how troubleshoot this?

ok, never mind, found it. using trick (controlmaster) in ssh config file share ssh connections, new connections reusing old connection.