How do I fix my custom domain propagation problems?
There are a handful of reasons why you might be experiencing what looks like propagation problems with your custom domain.
For a true propagation problem, there’s actually nothing to fix—you just need to wait up to 24 hours for the Internet to distribute your new domain settings.
Here’s why …
Every server on the Internet has a map that it uses to send requests to different custom domains and those maps aren’t updated instantly. That would be horribly inefficient and cause the entire Internet to slow down. Instead, these maps are typically updated every 4 to 24 hours, depending upon the needs of the particular server.
These days, servers tend to ask for map updates much more frequently than once every 24 hours so it’s safe to say that if your domain isn’t working properly after 4 hours then you should double-check your settings.
In other words, you probably don’t have a propagation problem, but rather a problem in your settings ...
To help you figure out what’s wrong, we have a thorough step-by-step troubleshooting guide for getting your custom domain to work:

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