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Here are some of the tips and trick you can follow when diagnosing network firewall issues, download this guide for more:
• Check the change management logs. Sometimes, network problems are caused by recent changes in the environment that have unintended consequences. You can use the logs to see what has changed and how it might affect the network.
• Use network diagnostic tools. There are many tools available that can help you troubleshoot network issues, such as ping, dig, traceroute, Wireshark, Datadog, etc. These tools can help you test connectivity, DNS resolution, packet capture, network performance monitoring, and more.
• Follow an escalation framework. If you can't solve the problem yourself, you should escalate it to someone who can. You should have a clear process for reporting and resolving network issues, and document your steps and findings along the way.
• Check the firewalls, antivirus software, and malware software. Sometimes, network problems are caused by security issues that block or interfere with traffic. You should make sure that your firewalls, antivirus software, and malware software are working correctly and not causing any conflicts or false positives.