Zeq2 "No Response from Master Server"

What did it mean "No response from Master Server"
Yesterday i saw 5 Servers online.

if zeq2 uses my master server it may be down sometimes, so then there will be “no response.”

Question, is it possible that someone can shut down your master sever “website” with out your permission?

We don’t discuss security issues in public. If you have specific information please feel free to e-mail me. zachary@ioquake.org