Maybe your node is fine. On my node I experienced very slow network performance even though I had set up dns using cloudflare.

• Allow rDNS (dns PTR record) setup in reverse-zone of assigned IPv4-address & IPv6-address ?

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Seems DNS cannot resolve anything i throw at it. /etc/resolve.conf has google's DNS but i keep getting "Temporary failure in name resolution"

* rDNS update

• They support Delegation of rDNS/reverse-zone to customers nameservers, after 100 days of active service . ( So For 1st 100 days, customer's/VPS-owner's all domain's all rDNS (PTR DNS record) of IPv4

* RDNS (PTR DNS): Configurable via control panel, API, or ticket system

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UDP traffic / DNS Port 53 and NTP it's blocked , for prevent more DDoS attacks , you prefer you server to be offline or to be online?

AKA ... DELEGATE REVERSE-DNS ... SUB-DELEGATE REVERSE-ZONE ... DELEGATE RZ W/ NS ... REVERSE DNS DELEGATION ... etc

Custom Reverse DNS

• And VPS-provider/operator (or VPS-operator's ISP or UPSTREAM-Provider) will also configure their DNS settings & allow to DELEGATE NS (of my/our/VPS-Owner's own IPv6 /48 SubNet) toward our/VP

Basically everything the same. Except that I use DNS from 1984 website.

DNS server

Reverse DNS Configuration: Yes

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* Check the shared hosting account DNS Management look fine.

Hello , yes we blocked recently port 53 (DNS) and UDP Traffic (permanently), in recent weeks we have received several DDoS attacks , we solve one method and another appears , we try for fix this.

My system also reported DNS loss. Everything is working again.