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Can anyone tell me why I can only connect to our AS/400 by its IP address and not he serial number?
Because networks don't route packets according to serial number. They route packets according to IP address. Consequently, that's the only way you can make a connection using TCP/IP.
However, there exists a "name to number" lookup function under TCP/IP called DNS. With DNS you can put a string called a "domain name" into a central DNS database, and TCP/IP software can look that name up in that database to get the IP address.
There's also an older method of doing the same thing called a "host table", but that only affects the computer that it's on, unlike DNS that makes the name available to everyone.
At any rate, subject to a few rules, you can put any name you like into DNS. If you want to, that name could be your serial number. That way, you'd be able to "connect by serial number." I suspect that's what your previous jobs had done. (And it's also what I do here)
However, it's not REALLY connecting by serial number. It's trying to find an IP address for a domain name where the domain name HAPPENS TO BE the same as the serial number. In the end, it's only the IP address that counts.
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