On Tue, 21 Apr 2020, Steve Gilberd wrote:
I've set up a RIPE Atlas probe for that server on IPv4 - hopefully it may
help give you some insight into where the problem might be. Will check
every hour for the next two days, from 1000 different network locations
globally.
https://atlas.ripe.net/measurements/24811333/
Thanks, Steve, that's been hugely useful, and has enabled me to go back to
my colo and ask them to dig harder, particularly into seeing if one of
their upstream connectivity providers has switched on some kind of
filtering.
Thanks to all who responded directly; all suggestions were helpful.
--
Tom Yates - http://www.teaparty.net
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