Unable to access to octoprint with a Macbook

Hi , i've a big problem .
In the past i used the macbook , desktop pc with W10, iPhone ecc to access in my octoprint server.
Now i cant access to the server with macbook , it remain in Connecting to OctoPrint's server... and nothing appear. With other PC no problem , no problem with iPhone or any other device .
BUT IF I USE MY DDNS TO ACCESS IN THE SERVER THE CONNECTION IS OK .
With my remote address i can use octoprint but in local nothing. Why ?
I do an update and upgrade, i do a restart in safe mode , i try other browser e.g Safari , Chrome , Firefox.

Anyone can help me ?