Prism 6 is having trouble connecting to ww.graphpad.com for silent activation. What could be the issue?

In September 2017, we changed our web server to require traffic to www.graphpad.com to use the secure protocol, https.

The problem is that Prism 6 is trying to connect using the insecure  http protocol.

It is easy to resolve. Silent activation is configured in the file StartupConfig.xml. Edit it to include the following line which will configure Prism to use https.

<silent-activation-url>https://www.graphpad.com/api/activation/</silent-activation-url>