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Why does my instance change whenever I refresh my sandbox?

Knowledge Article Number 000229510

Please note that there are several different instances that your Sandbox may be on: CS1, CS2, CS3.  It is important to know that the instance in which your Sandbox resides is subject to change when a refresh is performed.  At the time of a refresh, an instance will be selected for your Sandbox. Your refreshed Sandbox may appear on a different instance, and have a different URL after it is refreshed.

For example, the bold portion in the URLs below indicate which instance your sandbox is on:

It is a best practice to always log into your sandbox organization via the login URL.

See Also:
Sandbox Setup Tips and Considerations

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