This post onMiniTool Websitewill show you how to fix this issue in detail.
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This error occurs rarely and rebooting your setup is a quick fix for that.
How to Fix Windows 10 VPN The Specified Port Is Already Open?
Step 1. select thegearicon to openWindows tweaks.
In theSettingsmenu, tap onNetwork & Internet.
Choose one and hitConnect.
PressWin + Sat the same time to evoke thesearch bar.
Typecmdin the search bar to locateCommand Prompt.
Right-tap on it to chooseRun as administrator.
In the command window, typenetstat -aonand hitEnterto see the ports that are currently being used on your PC.
Look for port 1723 and then launch the following command.
taskkill /F /PID 1723
you better change the number at the end to match your process.
Step 6. power cycle your gear.
Typenetsh int ip resetand hitEnter.
If your use IPv4, runnetsh int ipv4 reset.
If you use IPv6, runnetsh int ipv6 reset.
PressWin + Rto open theRunbox.
Locate the following path:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
Step 4.
Right-choose the empty space of the right pane and chooseNew.
SelectMulti-String Valuein the context menu and name it toReservedPorts.
Enter1723-1723in theValue databox and hitOK.
