Make sure you update cPanel

I'm the owner of the dnsmanager.cc

Same. We manage several thousand domains for clients and give the option for 3rd party DNS when the registrar is lacking a facility. I'm wary of ones that charge by volume of queries. I'd trust Amazon

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Has anyone used dnsmanager.cc ?? is it even a service or just a front end to DNS management I doubt.

This isn't the first full downtime of HE DNS over the last years... they are ok for personal use, but unfortunately no one should expect 100 % uptime from them.

DNS Manager.

I run my own off of 2012R2 using the built in dns server role and I also have failover dns servers on other nodes to pick up if the master dns server fails(as I set the master to be the primary zones

replying emails are failing with stuff about bad DNS in the NDRs.

The dns.he.net interface is undergoing some maintenance. The maintenance should not take longer than about 60 minutes to complete. Please try back later.

dns is down. About 1 hour ago all my master zones were gone from my account. Now, last time I was able to check, slave zones were also gone.

dns.he.net down here for me, along with all of my sites that use HE DNS (Image)

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I am unable to resolve he.net or bgp.he.net from multiple nameservers.

Seems down still from here - NXDOMAIN when querying for the DNS record.

It might rely on the records listed on the local DNS side too. I think @cassa has done this, if memory serves, and might be able to shed some light on it. It isn't a feature I specifically advertise,

* Don't forget to set your DNS entry with your provider accordingly.

Use a DNS service with auto fail/remove when a site is down, I believe GBhouse's stuff does that, or get a anycast IP from them.

Well, using Rage4 with DNS Failover and Statuscake/UptimeRobot is a start.

Just have more that one thing every step of the way with a mechanism that makes sure the next step is always online, so multiple DNS servers that change the record to point to a server that is online,