以下是收到的邮件通知，说容易遭受DoS攻击，但没说该怎么处理。
KiwiVM has detected an insecure recursive DNS resolver on IP x.x.x.x, which may result in your server getting involved in DNS Amplification DoS attacks.
To prevent this from happening, KiwiVM has blocked port 53 in your server by adding the following iptables rule:
iptables -I INPUT -p udp --destination-port 53 -j DROP
You can fix this vulnerability by securing your DNS daemon (or by removing it from your server).
Once this vulnerability is fixed, you may remove this iptables rule.
Yours truly,
KiwiVM vulnerability scanner
KiwiVM has detected an insecure recursive DNS resolver on IP x.x.x.x, which may result in your server getting involved in DNS Amplification DoS attacks.
To prevent this from happening, KiwiVM has blocked port 53 in your server by adding the following iptables rule:
iptables -I INPUT -p udp --destination-port 53 -j DROP
You can fix this vulnerability by securing your DNS daemon (or by removing it from your server).
Once this vulnerability is fixed, you may remove this iptables rule.
Yours truly,
KiwiVM vulnerability scanner
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