- If a firewall is set up that is blocking the local machine from talking to itself (this tend to be a problem more associated with MS Windows); or
- If for some reason, the system is unable to translate the special name "localhost" to refer to the machine you are running on; in particular it should typically translate to 127.0.0.1 (or perhaps the IPv6 equivalent); this is what is happening to you.
Live editor connection error
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I have 2018a (update 3) installed in OSX. When I tried to use the Live editor, the following error appears:
This webpage is not available
ERR_NAME_NOT_RESOLVED ReloadHide details
The server at localhost can't be found, because the DNS lookup failed.
Walter Roberson on 7 Jul 2018
There are several parts of MATLAB that are implemented as separate processes, that MATLAB communicates with using TCP on the same machine.
Unfortunately, that type of configuration can have difficulty in a couple of circumstances:
See https://www.tekrevue.com/tip/edit-hosts-file-mac-os-x/ for information on how you can edit the file that OS-X uses to resolve names locally. The entry that is needed is
(exact spacing is not important.)
If that entry is already there, then name resolution is failing on your computer for some unknown reason, and I would recommend rebooting in that case.