If you purchase an existing domain name that was already used by someone else what are the ways in which the domain could have been broken by the previous owner? Are such problems common and are there tools to detect them before purchasing a domain?
Two examples: An HTTP server serving the domain could have returned permanent redirect making a domain unusable for visitors that received the redirect until they clear browsers caches.
Similarly, a server could have returned HTTP "Strict-Transport-Security" header making a domain unusable over HTTP for visitors that received the header.
Any other examples?