问题
I am working on a Heroku and don't have much background in networking.
The app I am working on seems to be unreachable from some places.
- We got reports from people not being able to access it
- A ping service we use (Statuscake) reports that the site is consistently unreachable from certain node locations
To fix that, we moved DNS to Amazon Route 53.
A week after, there is a change in what countries work by the ping service, but essentially we're still permanently down for some world locations, while maintaining almost 100% uptime in others.
Unfortunately, none of the people who reported site down are able to debug with us.
What are the things to do / check in such situation?
来源：https://stackoverflow.com/questions/22611057/amazon-route-53-heroku-app-not-accessible-from-certain-places-what-to-do