This is the reason an: ERR_ADDRESS_UNREACHABLE, same error on multiple web sites, Frys Food Stores, Eclipse IDE, Xmind and Stack Exchange. But others load just fine.
Xmind: The Best Brainstorming & Mind Mapping Tool is unreachable.
ERR_ADDRESS_UNREACHABLE
Tim Cerka
If that is xmind . com, it opens by me (you can post links using the source tag (the </> button)).
Looks like a network or dns issue to me.
Did you do something yourself? Setting up adblocker, hosts file, pi-hole, new firewall. Otherwise try changing the dns. You can also temporarily test a hotspot from your smartphone to test if the problem is in your provider or router.
Is your system up to date, and what kernel are you using? There was an issue long time ago in the kernel producing this error. //EDIT: no it was this error ns_error_connection_refused
What DNS servers are you using?
Perhaps those sites are IPv4 only, and your connection is IPv6 only. In this case, your ISP should have some kind of 6-4 translation method which may not be working on your PC.
One thing you might want to try is this troubleshooting guide with many useful tips on things to investigate - the results of these sort of tests might give a clue to the problem (share the command and results here if you don’t understand the output - someone will know if it indicates a problem):
For some of the tests you may need to install some extra packages to get the tools.