Online updates via the Snow Update Service require a network connection to the following endpoints: 

If the URLs are not reachable, this can partial or complete failure of the Snow Update Service updates. 

Testing Connectivity

Most of the URLs required are browseable like any other web page. Attempting to reach them in your browser, you should see a list of operations for the API, as below:

Note: https://sus.snowsoftware.com/api should provide a welcome message when browsing to it, confirming that it is reachable. The same is valid for https://scs.snowsoftware.com/api which is only used for Snow Analytics (Risk Monitor).

Alternatively, you can use ping by issuing the command below for the URL under scrutiny: 

ping sus-as-foundation.azurewebsites.net

the results of which should appear as follows:

 

Flowchart description of how Snow Update Service Foundation handles the traffic: