If security or other tests report that you are unpingable, the reason is most likely a setting in either your firewall or, if you have one, your router. You will need to determine where the signal is being intentionally dropped and make the changes there. The best way to get help in this process is:
If you have a firewall, visit the DSLR Security forum.
If you have a router, visit one of the equipment forums dealing with your brand of router.

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by 2kmaro