Thread:Project:Support desk/SMTP: Failed to connect socket/reply

Open a command prompt from the server/computer which is running MediaWiki, and type:  (changing X.X.X.X with the actual IP address of the SMTP server. If you get a timeout attempting to connect, then something is blocking the connection between the computer and the SMTP server, being either your firewall or a firewall in the SMTP server, assuming of course that the SMTP server is working and accepting connections on that port.