Are you using a VPN network? I have had dodgy connectivity at times with my VPN so I avoid using it when playing. Couple of things you might check...some ISPs are known to push firmware updates to your modem/router (I have AT&T and they do this under the radar occasionally and it has messed with some of my port presets). Overall this shouldn't matter if you're just trying to reach the master server list unless you have setup some sorta custom configuration prior; but, you just never know. Also, if you have the availability, fire up a hotspot on your phone and try connecting that way to start narrowing down if it's a home network problem for sure.
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