Solved
Web Frame - Showing refuse to connect
I used Web Frame and linked with an external URL. During view mashup it is showing as refuse to connect. Attached a screenshot.
That's because, as a security best practice the community.ptc.com site does not allow being embedded in a foreign page.
You can see this message and more details in the console:
However, you can somehow achieve this functionality if you trigger a Navigation function to open the community website in either a new browser window or a popup window (that will effectively have the community site alone).
You can see both examples below, in Firefox.
