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In response to my question about what could cause a system to disregard its own host table,

On 4/15/22 11:31 AM, Jack Woehr (of the Midrange List) wrote:
Which order the search happens, DNS or hosts table first, is an option in
IBM i TCP configuration. CFGTCP option 12.

Fascinating. I can't begin to imagine how setting it to "*REMOTE" could possibly be useful (or that the OS would *allow* LOCALHOST or LOOPBACK to be overridden), but I see that at least one other customer box has this setting.

I will note that this, by itself, wasn't enough to kill Tomcat. It was a combination of this, and a DNS (presumably a "house DNS" rather than a public one) that recognized LOCALHOST and LOOPBACK, and responded with "LOCALHOST.<domain redacted>" or "LOOPBACK.<domain redacted>," and an address that was something other than, that did it.


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