I noticed that my sub-domains stopped working properly. I upload a website to one of the sub-domains but when I want to access it through a web browser, it does not work. I paste the same route as shown in FTP (ex. sub.domain.com/index.php ) and I get the following error: "Red - Error de Lookup DNS. URL is not valid". The domain I'm talking about is fully hosted by dreamhost.
Could this happen because of having other websites using same domain sub-domains (some of them being redirected)?