Currently Being ModeratedJul 30, 2012 9:14 PM (in response to ronaldfromdresden)
I mean when I click on the network computer in Finder, and then click Screen Sharing, nothing happens. Worked fine before installing Mountain Lion. Computer I am connecting to runs Lion. Used screen sharing everyday before upgrade without issue.
Currently Being ModeratedJul 30, 2012 9:41 PM (in response to kindian)
Screen Sharing works just fine for me both ways with 10.7. What happens when you use the "Connect to Server" window? With finder in front, click the "Go" menu and select "Connect to Server". In that window, add text to the field looking like this:
Do you get any kind of login window?
Currently Being ModeratedJul 31, 2012 12:44 AM (in response to mattw gx)
Having similar issues. AFP sharing works but screen sharing is failing between cetrtain machines. Works after I restart target Mac, but then will fail later. Do not get error message. VNC: fails same way. No message
Currently Being ModeratedJul 31, 2012 1:21 AM (in response to kindian)
Works fine for me using 10.8 to 10.8, 10.8 to 10.7 etc - have you enabled BackToMyMac in iCloud preferences, and then in sharing settings checked screenshare - you will need to enable this for both Macs.
Currently Being ModeratedJul 31, 2012 1:55 AM (in response to Vestan Pance)
Still having issues. I must have some kind of port blocking enabled, but cannot figure out.
Mac A is 192.168.0.101
Mac B is 192.168.0.100
Mac A can screen share or ARD with Mac B and other machines on network
Mac B cannot screen share or ARD with Mac A, and other machines on network also cannot screen share with Mac A
All machines can file share with Mac A however.
Also worth noting that reboot of Mac A seems to correct the problem for a time, but eventually connections get blocked again
Currently Being ModeratedJul 31, 2012 10:25 PM (in response to kindian)
I was having the same problem and what worked for me was starting with one mac: I selected the screen sharing and file sharing (with default setting... no changes) in the System Preferences -> Sharing. I then deselected and reselected the Back to my Mac in Preference -> iCould, then restarted. I followed this process on both my MBP and Mini and the Screen Sharing works great now
Currently Being ModeratedAug 1, 2012 4:35 AM (in response to kindian)
Same issue, formerly working fine now working on LAN but not WAN.
Interestingly, Back to My Mac in iCloud panel of system preferences keeps reporting that UPnP is turned off on my router though I have confirmed that it is in fact on (and rebooted router several times).
Currently Being ModeratedAug 2, 2012 11:02 AM (in response to kindian)
I'm having the same issue randomly as well on a local LAN behind an Airport Extreme base station.
I have a mixed environment of Mountain Lion, Lion and Snow Leopard. I'll be able to screen share fine most of the day but then there will be hours when non of the machines will screen share with each other.
Restarting doesn't help.
This didn't happen before 2 of my systems were upgraded to Mountain Lion.
Currently Being ModeratedAug 2, 2012 1:55 PM (in response to MacRat)
I did some testing.
When I set up a separate LAN and connected a Leopard and Snow Leopard system, they were able to screen share just fine. When I put them both back on the regular LAN, they were unable to connect.
Then I disconnected the 2 Mountain Lion systems from the LAN and once again the Leopard and Snow Leopard systems could screen share with each other again.
I don't know what Mountain Lion is doing, but the results are like a poision the LAN.