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The main page of your client application will also need to be updated to have the correct location for the signalR end point. Typically the main page is the index.html page. Check the script list in that page for any fully qualified URLs to SOA and update them as necessary.
You may potentially need to update the Attributes on the Authentication Provider records. This will vary depending on the Authentication Provider, and it is only necessary if those attributes reference a fully qualified service end point.