So I'm on a hotel WiFi that has been working fine for several days.

Suddenly, I'm not able to use many programs on the internet.

Safari says "Can't find server".

Ping says "Can't resolve: Unknown host".

Meanwhile, I can browse just fine with Google Chrome and nslookup immediately returns correct results.

I've tried:

sudo dscacheutil -flushcache
sudo killall -HUP mDNSResponder

No change.

This has happened to me before, but usually cycling the WiFi, or the commands above or a reboot would fix the problem. Not now.

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