After updating my MacBook Air to ios 11 (beta), Big Sur, I can no longer connect to my Mac Mini (El Capitan) through finder. I can view the Mini in the finder and I can screen share it on my Air, but when I attempt to connect to it to view files, I get an error message claiming "There was a problem connecting to the server “xxxx". I have rebooted both computers and also my router. Any ideas? Thanx in advance.