anchor.diff:  ---
   ## <a id="errors"></a> Errors
   
  -1. Invalid service principal
  +* Invalid service principal
   
     ```
     http_get_response - get_token - http error: 400
  
positive.code: 
    This error indicates that unknown VM (to the Director) took up the IP that the Director is trying to assign to a new VM. Either let the Director know to not use this IP by including it in the reserved section of a subnet in your manual network, or make that IP available by terminating the unknown VM.
  
  1. Limits of Premium Storage blob snapshots
  
    ```
    Error 100: Unknown CPI error 'Unknown' with message 'SnaphotOperationRateExceeded (409): The rate of snapshot blob calls is exceeded.
  
negative.code:       enable_snapshots: true
      ```
  
    * The time between consecutive snapshots by BOSH is less than **10 minutes**. The limits are documented in [Snapshots and Copy Blob for Premium Storage](https://azure.microsoft.com/en-us/documentation/articles/storage-premium-storage/#snapshots-and-copy-blob).
  
    The workaround is:
  
  