How to Generate a PCAP File Using Wireshark

Wireshark is a network protocol analyzer that captures and examines network traffic in real-time. It enables identification and diagnosis of connectivity issues by analyzing data packets, including their source, destination, protocol, and content. This tool is particularly useful for troubleshooting server connection problems.

Download and Install Wireshark

Navigate to the Wireshark download page
Click "Download" in the top navigation bar
Locate the "Stable Releases" section and select the Windows x64 Installer for your system
Run the downloaded .exe file
Click "Yes" when prompted to allow Wireshark to make changes to your device
Follow the installation wizard:
- Click "Next"
- Review and accept the terms of service by selecting "Noted"
- Continue clicking "Next" until the "Install" button appears
- Click "Install" and wait for completion
- Click "Next" then "Finish"

Capturing Network Traffic

Starting the Capture

Launch Wireshark
Click "Yes" when prompted for administrator privileges
In the filter textbox, enter: host [your server IPv4 address]
Double-click your active network connection (typically WiFi if not using ethernet)

Recording Traffic

A new capture window will open showing real-time network traffic
Attempt the problematic task (e.g., connecting to your server via RDP)
Allow approximately 5 seconds after the connection attempt
Click the red "Stop" button in the top-left corner to end the capture

Saving the Capture

Click "File" in the menu bar
Select "Save As"
Enter a filename for your capture
Click "Save"

The saved .pcapng file contains the network traffic data and can be analyzed to identify connection issues. Failed protocols and connection problems are typically highlighted in red within the capture data.

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