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Home » Kerio User Forums » Kerio Control » Fixing Open DNS resolver (Should I disable the DNS forwarding service or would it affect VPN connections?)
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Andre

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We have tested our IP on openresolver.com and it has detected an open resolver DNS configuration.
We would like to fix that.
Our setup is:
- Kerio Control as firewall.
- Windows Server 2012 R2 as domain controller and therefore as DNS server.
- Kerio Control is connected to the AD.
- Let's say our local IP range is 10.90.0.0/16
- Let's say VPN connections range is 192.168.9.0/24

The first question is if this issue should be resolved at firewall level (Kerio Control configuration) or at DNS server level (WinSrv DNS config).
Currently, on Kerio Control, the DNS forwarding service is enabled. I am guessing this is needed by VPN clients to correctly resolve hostnames to our local network, and vice-versa. But I may be wrong.
On the Windows Server DNS configuration, DNS recursion is not disabled.

Thanks in advance to anyone who may help me to fix this open dns resolver and at the same time, keep VPN connections running smoothly.

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Andre
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