I saw a post with the same message from about a year ago. The latest version update seemed to indicate that this had been fixed, but it still doesn't seem to work. The port number disappears in the redirect url.
I saw a post with the same message from about a year ago. The latest version update seemed to indicate that this had been fixed, but it still doesn't seem to work. The port number disappears in the redirect url.
What was fixed in the latest version was being able to enter a URL containing a port number in a Website Field on your form, it wasn't related to the confirmation redirect functionality.
I have replicated the issue you are reporting, it is indeed stripping out the port number when it executes the redirect. It's being corrected internally and it will updated and corrected in the next Gravity Forms release.