When a VPN is running and your PC goes to sleep mode because of inactivity, the non-sharable connection is still locked. Therefore, when you are trying to reawaken your device, Windows 10 the specified port is already open error will appear. This post on MiniTool Website will show you how to fix this issue in detail.
VPN Error 602 The Specified Port Is Already Open
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However, you may encounter some issues when you are trying to connect to the internet via VPN, for example, Windows 10 the specified port is already open error. This error occurs rarely and rebooting your computer is a quick fix for that. If this error still crops up after restarting your device, you can try the method below one by one until this error is fixed.
How to Fix Windows 10 VPN The Specified Port Is Already Open?
Fix 1: Connect VPN Manually
You can go to settings to open your VPN manually to see if it works fine.
Step 1. Click on the gear icon to open Windows Settings.
Step 2. In the Settings menu, tap on Network & Internet.
Step 3. In the VPN tab, you can see all the available VPN connections that you set up on your device. Choose one and hit Connect.
Fix 2: Modify Connection Port
Since the “VPN the specified port is already open” error is connected to the port, you can modify the connection port and then restart your computer to fix it.
Step 1. Press Win + S at the same time to evoke the search bar.
Step 2. Type cmd in the search bar to locate Command Prompt.
Step 3. Right-click on it to choose Run as administrator.
Step 4. In the command window, type netstat -aon and hit Enter to see the ports that are currently being used on your PC.
Step 5. Look for port 1723 and then run the following command.
taskkill /F /PID 1723
You need to change the number at the end to match your process.
Step 6. Restart your computer.
Fix 3: Reset TCP/IP
Chances are that there are some issues with the TCP/IP of your network. In this case, you need to reset TCP/IP to fix the “Windows VPN the specified port is already open” error.
Step 1. Run Command Prompt as administrator.
Step 2. Type netsh int ip reset and hit Enter.
Step 3. If your use IPv4, run netsh int ipv4 reset. If you use IPv6, run netsh int ipv6 reset.
Fix 4: Change Registry
The last resort to fix “the specified port is already open VPN” error is to change the corresponding registry.
Step 1. Press Win + R to open the Run box.
Step 2. Type regedit and hit Enter to open Registry Editor.
Step 3. Locate the following path:
Step 4. Right-click on the empty space of the right pane and choose New.
Step 5. Select Multi-String Value in the context menu and name it to ReservedPorts.
Step 5. Enter 1723-1723 in the Value data box and hit OK.
Step 7. Reboot your PC.