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is this cert in the update the reason apps like pokevision stopped working?

I think it's a combination of a quite large IP ban wave and sternly-worded letters to the developers of said tools.

I don't know for sure, but I'm going to say 'not entirely'.

Certificate pinning would prevent you from sniffing the requests, and if they made API changes, you would be unable to analyze them.

So I think the reason Pokevision stopped working is because they may have made API changes, but they've been unable to see what the changes were.

Pokevision stopped working because they banned the whole ec2 IP range.

I believe you, so please don't take this is a challenge. It's pure curiosity that prompts me to ask: Do you have a source for more info on this IP range ban?

One source is a GitHub issue for one of the popular open source Pokémon Maps -- https://github.com/AHAAAAAAA/PokemonGo-Map/issues/2777 . AWS/Heroku/Azure/DigitalOcean (mostly) seem to be banned.

The pokemongo dev forums on reddit have been compiling a list of known hosts that will result in a 403 response code when an api call is requested.

https://www.reddit.com/r/pokemongodev/comments/4vhygk/vps_pr...

And added scanning rate limits.

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