Last November there was a post similar to this. I think this is it:

Searching for "dns cache" at found this gem.

IBM Reference #: 86256A5C00437742

Clearing the DNS Resolver Cache

Incident Summary

Is there a way to clear the DNS resolver cache?

Using the CFGTCP command, select option 12. Pressing the Enter key will
clear the DNS resolver cache (sometimes referred to as the NAME cache).


Fred Horvat wrote:
Due to a Windows Server swap we need to flush the DNS Cache on our iSeries.
How does one go about this without IPLing or Stopping TCP and Restarting

Fred Horvat



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