On Safari browser, getting an error: "This form is not secure. Are you sure you want to submit it?", even though the page is secured by HTTPS

Question

Any ideas why? The form processes fine in all major browsers (Chrome, Firefox, IE) but on Safari we are seeing a pop up that says The Form Is Not Secure. The page is definitely https:// and the SSL is setup appropriately when I reviewed it. Could it be another issue?

Solution 1

Change the link to https:// instead of http:// So basically ad an "s" which let's the browser know the link is secure. It doesn't actually secure the page but it stops the error message. The problem happens when you are sending someone from an https page to an http page so it's the transition that triggers the error message.

Solution 2

Is there any chance the form is contained within an IFRAME that, itself, is not pointing to an https url?