Screen share trouble. I have it working once logged in but I can't figure out how to actually log in to my other Mac remotely. When I hit connect I get this. Can someone please tell me what I'm doing wrong. Firewall is off. Thank you.

Screen share trouble. I have it working once logged in but I can't figure out how to actually log in to my other Mac remotely. When I hit connect I get this. Can someone please tell me what I'm doing wrong. Firewall is off. Thank you.