I ran into this issue again and although I am sure I write about it before, I can’t find a reference to it.
In Dynamics CRM 4.0 it was quite common for companies (on-premise) to have custom ASP.NET pages that were shown within the context of the Dynamics CRM web site. Since they were always in a specific folder (the ISV folder), you could use a relative path to locate that page.
Here is an example of this practice:
The problem appears after one of the updates to Dynamics CRM 2011 (I can’t remember which), but if you edit the URL field, CRM will automatically add http:// to the beginning of the URL. This will end up producing a totally invalid URL and your page will not load in the iFrame.
Unfortunately, once the change is made, there is no undoing it. Here are your options:
2. Export, manually edit, and reimport the default solution.
3. Change the path to one that is fully-qualified.
#1 is the easiest to implement.
#2 is a painful, but one-time charge.
#3 will cause issues should you have a multi-server environment (development, test, production) and are constantly moving the solution around.
So this is a fairly simple and innocuous change that many people will not look at twice – until they make a change and find that their iFrame no longer works, that is…