Q: How can a program check whether the HTTP server is up? What about FTP? Email? Telnet? Can PING check a particular port? A: The PING command tests only basic IP connectivity from one machine to another. It works at a very low level and doesn't understand the TCP layer that most of today's TCP/IP software uses. If you're trying to tell whether a particular server is online, the PING command is the wrong tool. Instead, this article presents a simple Check TCP Server ...

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