What to do when the pfSense alias with FQDN is not working? Let’s take a closer look at this article. At Bobcares, with our pfSense Support Services, we can handle your issues.

Fixing the “pfSense Alias with FQDN is not Working” Issue

We can take the below measures when we face an issue with the pfSense aliases setup with the FQDN not working:

1. Initially, confirm that the FQDNs can be successfully resolved by the pfSense system.

2. Verify the DNS servers that are being used by the pfSense system are the right ones.

3. When utilizing FQDNs, confirm that we’ve set up the alias as a “Host(s)” type alias.

4. Check to see if the source or destination fields in the firewall rules are using the FQDN alias correctly.

5. Verify that the rules employing FQDN aliases are arranged correctly and that no rules that clash are preventing traffic from moving.

6. We also need to clear the DNS cache of the pfSense machine.

7. Look for DNS-related failures or abnormalities in the pfSense system logs (e.g., Status > System Logs).

8. Check whether DNS requests are being sent out and responses are arriving as expected using the pfSense packet capture tool.

9. Make sure the firewall or NAT restrictions aren’t too severe because they could be preventing DNS traffic.

10. Make sure that the alias is configured to refresh or update at the proper frequency if we’re using one that should dynamically update based on FQDN changes (such as an alias connected to a Dynamic DNS service).

11. Lastly, confirm the pfSense installation is recent.

[Need to know more? Get in touch with us if you have any further inquiries.]

Conclusion

To sum up, our Support team reviewed the troubleshooting tips for the pfSense Alias with FQDN is not Working” issue.