# Insufficient DB instances available
<a name="insufficientDBInstancesAvailable"></a>

 The `InsufficientDBInstanceCapacity` error can be returned when you try to create, start, or modify a DB instance. It can also be returned when you try to restore a DB instance from a DB snapshot. When this error is returned, a common cause is that the specific DB instance class isn't available in the requested Availability Zone. You can try one of the following to solve the problem: 
+  Retry the request with a different DB instance class. 
+  Retry the request with a different Availability Zone. 
+  Retry the request without specifying an explicit Availability Zone. 

 For information about troubleshooting instance capacity issues for Amazon EC2, see [ Insufficient instance capacity](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/troubleshooting-launch.html#troubleshooting-launch-capacity) in the Amazon EC2 User Guide.