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Thanks, Appleoddity, that was it. UltraVNC had unexpectedly installed two different firewall rules. The "vnc5900" one was already in place, and I had hoped by modifying it to allow only certain IPs I could tighten up the rule and limit access. But it had also installed a "WinVNC" rule which was application based (winvnc.exe) rather than port based, and apparently that rule tool precedence over the "vnc5900" rule, causing my IP restrictions on that rule to have no effect. Consolidating the two rules into one now has the firewall working as expected.
– David White
Commented May 12, 2019 at 3:31
@DavidWhite: As the answer explained, it's not a matter of precedence. Failure to match an "allow" rule does not mean instant denial -- the firewall keeps evaluating rules all the way down the list until one matches.
– Ben Voigt
Commented May 12, 2019 at 3:55

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