Hi,

The DNS configured on your machine must be able to make conversion of the hostname to an IP address which can be reached (and well, the server must also be online).

Usually (but not always) this can be tested with the “ping” on command line.

There is a somewhat known … I guess you could call that an issue, that you could also check. Nowadays machines usually have both IPv4 and IPv6 address. At least Win10 prefers to always give the IPv6 address, thus if the server is not listening to that, you would get that error. It is possible that your Linux distro does the same.

You can try flags “-4” and “-6” for the ping command to force it to use equivalent IPvX. If the output of the “-6” is the same as without any flag, that is somewhat good indication that IPv6 addresses are preferred. After that check that does your server bind to IPv6 addreses.

By default + the samples of our SDK server side does bind to all IP addresses (except if Java 6 is detected, since there it didn’t work).

P.S.
In general, in an unrelated case, we might be able to receive both addresses (IPv4+IPv6), so some (somewhat distant) future version might be able to try both. Though personally speaking it is a bit of a question is this something we should do, or is it just a misconfiguration of the server or OS if we get e.g. IPv6 as the first result if it could not be used. Most applications _should_ be able to bind to IPv6 in my opinion. Though, then it is a separate question should IPv6 be used at all unless you need it (since e.g. in theory it could bypass a NAT, since there would be no need to, thus in a misconfigured network it could be that e.g. some internal servers would get a public IPv6 address that way, which could be bad for security, though that would be a firewall configuration mistake in turn then).

The hostname has a domain (albeit being the “local” domain), since it has a dot. That may affect things.

Hmm.. for your EDIT, I guess that works. Like typically I would sort of assume some company-internal-DNS to take care of that. But in the absence of that, your solution is probably what is generally used.

In general, I would maybe expect the LDS not being that much being used in practice in real productions, though my view of the whole world is limited. So there might be issues of some sorts.