Repair Guide for VPN Error 721 – Remote Computer Is Not Responding: You may encounter the following error message when trying to connect to a VPN using the Point-to-Point Tunneling Protocol (PPTP) client.
Error 721: The remote computer is not responding.
In this article, I will share some helpful methods to fix VPN Error 721 on Windows 8 or 8.1 or 10 or 11 or Windows server.
Why does VPN Error 721 occur?
Virtual Private Networks (VPNs) are quite popular among computer users today; in the past, only businesses used this service. Nowadays, regular computer users run VPNs on their devices, and you might encounter VPN Error 721 for one of the following reasons:
The network firewall is blocking the connection.
Antivirus software is stopping the service.
Incorrectly configured VPN settings.
The VPN server is down.
There is a glitch in the Windows operating system, etc.
How to fix VPN Error 721?
To resolve VPN Error 721, follow the methods outlined below.
Method 1: Repair Using Advanced System Repair Tool
This error often arises due to corrupted system files, missing system files, outdated software and drivers, registry issues, and more. It's best to optimize your computer and fix hidden errors to resolve this VPN issue. The Advanced System Repair Tool is one of the best PC repair tools that scans and fixes your computer issues and improves your computer's speed by up to 2 times.
Windows consists of a large number of dll files, exe files, sys files, various types of services, databases, and more, so it's not feasible to constantly monitor all files. This excellent PC optimization tool repairs damages, fixes errors, updates Windows and drivers, and silently removes various types of errors.
The Outbyte PC Repair Tool performs all the above tasks effortlessly and provides you with a smooth, error-free Windows environment to work in so you can focus solely on your tasks. 3 Steps to Fix This Error
Step 1: Download the Outbyte PC Repair Tool [File Size: 16.4 MB]
Step 2: Scan your Windows computer
Step 3: Click the "Repair" button to fix the error
Method 2: Network Firewall is Blocking GRE Protocol.
This is one of the main reasons for VPN Error 721. PPTP (Point-to-Point Tunneling Protocol) uses GRE (Generic Routing Encapsulation) to transmit data. Sometimes, the network firewall does not allow GRE to transmit data over port 47. Port 47 is the default port for GRE protocol.
To resolve this issue, you need to set up the following:
1. Configure the network firewall to allow GRE protocol 47.
2. Also, ensure that the network firewall allows TCP traffic on port 1723.
Configure the network firewall to allow GRE protocol 47 and permit TCP traffic on port 1723.
Step 1: Log in to your firewall.
Step 1: Go to Firewall > Service. At the bottom, click the Add button.
Step 1: Name it GRE. Select GRE Protocol (47) and click "OK".
Step 1: Save and close the firewall.
Method 3: Restart the Router
Restarting is a great remedy for any type of electronic device. Simply restart your router and then try to connect to the VPN.
Conclusion
In this article, I explained what VPN Error 721 is, why it occurs, and how you can fix this error on your device.
