How to correctly configure Windows Server 2019 firewall to support WebSocket communication?

Windows Server 2019 Firewall and WebSocket Communication: Troubleshooting

When deploying Spring Boot applications on Windows Server 2019, the front-end and back-end WebSocket connections (for example, ws://192.168.1.2:7076/showabe/frontEndWebSocket?category=tv) often encounters a problem: Only by disabling the firewall can you connect normally, even if port 7076 has been released. This article analyzes this problem and provides solutions.

Windows firewalls are based on port number filtering, not application layer protocols, so you usually just need to release the port. However, if the connection cannot be made after releasing port 7076, the possible reasons are as follows:

1. Firewall rule conflict: There is a priority for firewall rules. If other rules (such as blocking all inbound connections) have priority over the release rule on port 7076, the latter will be invalid. All firewall rules need to be checked and prioritized to ensure that the 7076 port rule has the highest priority.

2. Network configuration file mismatch: Firewall rules vary according to network configuration files ("domain", "dedicated", "public"). When adding rules, the selected configuration file must be consistent with the server's actual network environment. When the server connects to the company's intranet, select "domain", select "dedicated" for the home network, and select "public" for the public network. Configuration file errors can cause the rule to expire.

By checking the above two points, ensuring that the firewall rules are correctly configured and have the highest priority, and that the network configuration file is consistent with the server network environment, you can solve the WebSocket communication problems caused by the Windows Server 2019 firewall.

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