Editing Troubleshooting:Port Forwarding Troubleshooting (section)

== '''Verify IONOS Firewall:''' ==
   * Ensure the firewall rule is active and enabled

   * Check that no higher-priority DROP rules are blocking the port

   * Verify the rule applies to the correct network interface

=== IONOS-Specific Notes ===

* '''Firewall Location''': IONOS firewall is managed at the cloud infrastructure level, not on the VPS

* '''No Security Groups''': IONOS uses a direct firewall per server, not security groups

* '''Rule Priority''': Lower priority numbers are evaluated first

* '''Immediate Effect''': Firewall changes take effect immediately without server restart

* '''Multiple Rules''': You can have multiple rules; ensure no conflicting DROP rules have higher priority

=== Testing IONOS Firewall ===

If you suspect the IONOS firewall is blocking traffic:

==== '''Check IONOS Cloud Panel:''' ====
   * Verify the firewall rule exists and is enabled

   * Check rule priority (lower numbers = higher priority)

   * Ensure no DROP rules are blocking the port