I am trying to get screen sharing to work remotely on my Mac. I have my internet router is setup to permit this service through and with connection blocking turned off it is working fine. I have added an allow in connection blocking for screen sharing service in the untrusted network zone. I have added the network I am on mostly into the trusted zone, but there are times I can be anywhere and need to access this system. Screen sharing is enabled on my mac and internally I can remote the system fine. I cannot add IP Address I don't know to the trusted zone. the connection blocking rule for screen sharing is allow - all other connections.