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Internet connectivity may cause slows evaluations or cause unexpected problems (particularly in GUIs) when working in an environment with slow Internet or no Internet access at all. I know how to stop the Internet connectivity using the Preferences menu (Allow the Wolfram System to access the Internet) but I want to know if there a way to stop Internet connectivity programmatically.

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    $\begingroup$ $AllowInternet = False ? $\endgroup$ – Szabolcs Jan 25 '18 at 0:05
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    $\begingroup$ This certainly works as well as the CurrentValue approach. It would be nice to know if there is any difference between the two approaches. $\endgroup$ – Ariel Sepulveda Jan 29 '18 at 16:05
  • $\begingroup$ Good question, I do not know (you could ask Carl). But I noticed that once setting CurrentValue[$FrontEnd, "AllowDownloads"], it will also set $AllowInternet. The reverse it not true. $\endgroup$ – Szabolcs Jan 29 '18 at 17:56
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You can use:

CurrentValue[$FrontEnd, "AllowDownloads"]=False;

to disable the "Allow the Wolfram System to access the internet" preference.

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    $\begingroup$ It might be better to do this on the $FrontEndSession (if possible) $\endgroup$ – b3m2a1 Jan 25 '18 at 4:58
  • $\begingroup$ Do you know how your approach differs from $AllowInternet=False? $\endgroup$ – Ariel Sepulveda Jan 29 '18 at 19:00
  • $\begingroup$ One bit of information I found is that to use SendMail both parameters need to be set to True. $\endgroup$ – Ariel Sepulveda Jan 30 '18 at 22:33

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