Hi,
Gerade keine Lust meine Lösung, welche ich Mal im Apple Discussions Forum gepostet habe erneut auf deutsch niederzuschreiben, daher nun auf Englisch.
Hi,
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there is no need to disable IPv6 via terminal the off switch is build into the new server.app.
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Just open server.app switch to the "network" tab of your server that is listed under "hardware" and try to change the hostname (which one you choose is not necessary).
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After that you should see a menu where you can switch between different hostname types, which one you choose here doesn't matter either.
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Klick for example "hostname for internet" --> Next
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On the next screen you will see something like "change network" press it.
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After that you see a screen that seems equal to the network screen that you can find under "system preferences" now choose IPv6 and on the next input screen choose between "automatic" "manual" or "off".
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There you go!
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Sorry if not all of my text examples match the text on your server.app screens while I translated it from my german lion server.app version.
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Regards
Eldrik