What are the requirements for a domain to be added to the external domain list?

Related articles

• How do I set up authentication for a different domain?
• I checked the crawl results and some pages are not crawled. Please let me know how to deal with this.
• I am getting input errors after crawling. Is there any way to change the input values on the form and re-crawl?
• We are performing Ajax processing for an external domain on the subject site. Is it possible to diagnose the problem?
• Operation is possible on the Remote Browser and cannot be crawled as recorded.