Host Access Control rules not behaving as expected on AlmaLinux

Symptoms

Rules configured in "Host Access Control" in WHM do not take effect.

Description

The issue occurs when conflicting rules have been added outside of "Host Access Control."

Workaround

1. Access the server's command line as the 'root' user via SSH or "Terminal" in WHM.
2. Search for rules matching the target port.

   nft list ruleset|egrep 'table|dport #'|grep -B1 "dport #"

   Please note that "#" must be replaced with the target port number.
3. Identify the conflicting rule.
4. Find the chain and handle ID of the conflicting rule.

   nft -a list table $tablename |egrep 'chain|dport #' |grep -B1 "dport #"

   Please note that "$tablename" and "#" must be replaced with the name of the table the rule is in and the target port number, respectively.
5. Delete the conflicting rule.

   nft delete rule $tablename $chain handle $handleid

   Please note that "$tablename," "$chain." and "$handleid" must be replaced with the name of the table the rule is in and the chain name and handle ID output from the previous command.

Additional resources

Host Access Control