I am having the same issue.
When connecting through Amazon Silk, the browser for Echo Show 8, it used to work just fine but for about a week or so it doesn’t connect.
It doesn’t seem like there’s an option in Amazon Silk to save the file and run from it, so the provided workaround doesn’t apply to me.
No changes were made in my Windows server settings and the connection works for Android Viewer App, the issue seems to be the HTML viewer itself.
What else can I do?