MacOS 10.13.6 Beim Verbinden mit dem Server "localhost" ist ein Fehler aufgetreten

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I had the same problem on a brand new MacBook Pro with OSX 10.13.6 and I found the solution in this posting:

You have to edit the file /etc/hosts . In my case, it was empty and i had to add these two lines:

127.0.0.1 localhost
255.255.255.255 broadcasthost

That’s it, works perfectly now!