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Digital & Information Technology IT infrastructure

Find and match open ports and services in Windows


When running Windows, operating system tools allow you to find the mapping of a open TCP/UDP ports to a running service or application. Netstat: Displays protocol statistics and current TCP/IP network connections Use > netstat /? to find information about the options and usage for the command. To find all connections and listening ports, use: […]

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Digital & Information Technology IT infrastructure

Network connectivity troubleshooting step by step with commands


This post is an enhanced version of my post on common practices for troubleshooting firewall rules that have been implemented to allow a server to connect with another server. To help users in troubleshooting problems with network connectivity and firewall rule implementations, included below are step by step commands one can execute on a Windows or Unix […]

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Digital & Information Technology IT infrastructure

System administration 2: Firewall rules troubleshooting


The following is a list of common practices for troubleshooting firewall rules that have been implemented for a server’s connectivity to another endpoint. Confirm Firewall rules Implementation Operating system Level connectivity test on established ports from source server/firewall to destination server/firewall. Test should verify routing, network address translation, ports, and URLs where applicable. If there is […]