A master server is actually pretty good network diagnostic. It is sending and receiving UDP packets all over the internet every few seconds. The community masters stay in continuous contact with the game servers every 5 seconds or so.
So we can tell if the problem is on our end or your end. In this case i think the problem must be on your end.
I see that you successfully queried mine twice on May 17'th but nothing since then.
Could be firewall - could be the wrong DNS server is configured etc. Look for something on your side.
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