Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

How to Split DNS with Managed Namespace on F5 Distributed Cloud (XC) Part 2 – TCP & UDP

Re-Introduction In Part 1, we covered the deployment of the DNS workloads to our Managed Namespace and creating an HTTPS Load Balancer and Origin Pool for DNS over HTTPS. If you missed Part 1, fe...
Updated Nov 15, 2022
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Walter_Kacynski's avatar
Walter_Kacynski
Icon for Cirrostratus rankCirrostratus
Jun 13, 2025

Could you please provide more details on this?  I continue to get errors that port 53 is a reserved port and can't be used.

MichaelatF5's avatar
MichaelatF5
Icon for Employee rankEmployee
Jun 13, 2025

Hi Walter.  Did you Specify a new IP address on the listener?  You cannot use the default SLI or SLO IP Address as they are reserved for our local instance CoreDNS.