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Is there any way of opening a firewall port only to Heroku hosts? Since Heroku is a cloud service, is there any way I can ensure where are they connecting from? In Heroku docs only securing conections to RDS is documented but can I secure connections to an external VPS somehow?

Thanks a lot.

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Here's a list of the EC2 IP ranges: https://forums.aws.amazon.com/ann.jspa?annID=1233

I'm pretty sure Heroku is all US East, so you could open up to just those.

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The linked thread is no longer accessible. –  ripper234 Apr 28 '13 at 9:02
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