What API error messages indicate that Rally is down or in a maintenance period
We don't provide a status code specific to the actual "Status" of Rally to the API but our system will normally start returning errors (502 or 401 etc...)
As a general rule, it is important to bear in mind that it is not possible for us to guarantee that every request is successful due to the unpredictable nature of the Internet as well as our need to restart application servers. It is highly recommended that retry logic is implemented in your integration to mitigate any transient disruptions. A good retry routine will check the following:
Here is an article with more detail about troubleshooting API calls: Troubleshooting API request issues