If your external links are not working review the links to ensure that they are not broken links.
If you are still having issues make sure the link is a full link and not a shortened link this will also ensure that the link will work properly.
If your link still is not working please contact us at support with the following:
Your email you use to login to Net Engine
Your website URL and Name
The places you're trying to add the link
Any error messages you are seeing