Error message when HAA setup is performed 1) Port 53 is in use. 2) While performing the rlcheck command, "Fatal error: Unable to connect to remote '/var/opt/redislabs/run/pdns.controlsocket': Connection refused" even though all the ports are opened in Azure firewall.
Port 53 has a system-resolved listening by default. To run own DNS server, the port will show to be in use.
- ree up the port 53 by modifying the /etc/systemd/resolved.conf.
For the details, refer Ubuntu - How To Free Up Port 53 Used By Html? .
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