Report "Link to Webpage"

Hi all,

I am trying the link to webpage when creating a report in CRM 2013.

The report is a report hosted on an external SSRS instance.  I put the webpage url in the form.  It goes blue and I can click on it and it shows me the report.

However when I then save the report link and then try to open it - it comes up with "This webpage is not available".  Any ideas?

Many thanks

Dan