My servers have been dropped from the pool as well, but connectivity appears 
fine. 

Agree, seems to be a monitoring problem. 

Someone should ask Ask about it (I've been waiting years to use that line :)

> On May 21, 2017, at 09:50, Marco Senft <[email protected]> wrote:
> 
> Hello everybody,
> 
> According to https://status.ntppool.org/, the number of active IPv6 servers 
> went down today from ~1150 servers before 08:40 UTC to a bit more than 800 
> within one hour. Two of the servers removed from the pool are operated by me, 
> and after checking my infrastructure I cannot confirm any problems on my 
> side. I suspect something to be wrong with the monitoring system rather than 
> one third of all pool servers concurrently having a problem.
> 
> If I’m right, the monitoring system is ntplax7.ntppool.net. I created a RIPE 
> Atlas measurement of this system’s connectivity which you can look at here:
> https://atlas.ripe.net/measurements/8758007/#!probes
> This measurement also shows about one third of all probes not being able to 
> reach the monitoring system.
> 
> Can somebody confirm a problem with IPv6 pool monitoring?
> 
> Best regards,
> marco
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