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Rafi
@rafi
Spent last 3h figuring out why a server is not reachable in the network. Turned out the DNS was pointing to its private IPv6 address and the server was listening on IPv4 :') Why? Catch-all addresses like 0.0.0.0 in IPv4 and [::] in IPv6 are handled by two separate network interfaces in the OS. Quite obvious but easy to miss.
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Mark V.
@mikroskeem
That's why also sometimes you'll see localhost DNS address working weirdly with some deployments Specify localhost by default in the config, end up listening only on IPv6 by accident, then burn time on why you you're getting that connection refused error Various Linux distros behave differently with this detail...
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