ConcurrentRequestLimitExceeded
Example
{
	"code": "ConcurrentRequestLimitExceeded",
	"target": "Unknown",
	"details": [
		{
			"code": "ConcurrentRequestLimitExceeded",
			"number": 1716,
			"message": "Server busy",
			"description": "Server is currently busy serving other requests. Please try again later.",
			"faultCode": "Server",
			"helpLink": "http://developer.avalara.com/avatax/errors/ConcurrentRequestLimitExceeded",
			"severity": "Error"
		}
	]
}
Explanation

This indicates that the server is currently busy serving other requests. Please try again later.