Wrong reverse DNS lookup, whitelisting IP not working

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Jiří Merth

• December 08, 2025 08:30

Hi, 

we have a VPN server behind OPNSense+Zenarmor firewall. The OPNSense has set DNS servers 8.8.8.8 and 8.8.4.4.  From time to time the IP address of our VPN server is back resolved to wrong domain name (by the Google DNS?), which is then blocked as "Blocked" or "First Seen Site". I have added the IP address of our VPN server to Zenarmor's whitelist, but the exclusion does not work. So there are two problems:

1. our public IP address is resolved to wrong domain name

2. access to our public IP address is blocked even when it is whitelisted

Any idea?

 

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• Official comment

  

  SVN Support Team

  • December 08, 2025 11:38

  Hi Jiri,

  Thanks for reaching out and bringing this to our attention.

  Could you please provide the logs and configuration by following the steps outlined in the link below? I kindly request that you select all checkboxes. 
  https://www.zenarmor.com/docs/support/reporting-bug
   

  Best regards

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• 

  Jiří Merth

  • December 08, 2025 11:55

  Hi,

  thank you for your quick response. I have just sent the feedback as requested.

   

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