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octoprint seems to have a setting that involves googles DNS server.

my question is is that server used to access octoprint over the internet via printoid "android app" or via browser? if not then what does it mean? enter image description here

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The program is pinging that address to check the internet connection to "prevent resource intensive operations if it's already clear that they won't succeed anyhow". It checks for connectivity, if it has it then it will check for update otherwise it won't check for an update.

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    $\begingroup$ Right, just a DNS server they can ping that is extremely likely to be up and ping-able. If google's DNS servers are down, the world has ended! $\endgroup$ – Steve-O-Rama Nov 6 '17 at 19:08
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That's just Google's DNS (name resolution) server. 8.8.8.8 and 8.8.4.4 are the Google values. Your ISP will also have a DNS server that you could use, which is what it says to use Google's "if you don't know what to set here".

Using the Google values are your best bet since they'll pretty much absolutely always be online and available.

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