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PC running slow?
If you see the 721 Remote Access error message on your computer, check out these troubleshooting suggestions. However, VPN error 721 can occur if your network firewall does not allow traffic over your GRE protocol. Generic Routing Encapsulation Protocol is used in conjunction with Point-to-Point Tunneling Protocol to create VPNs around a server and client, or within clients.
Error 721 is a Microsoft error that occurs after an unsuccessful attempt to establish a VPN connection to the corporate network and also to the Point-to-Point Tunneling Protocol (PPTP) application. You may even get error 721 after unsuccessfully trying to optimize your dial-up connection after upgrading your laptop from previous changes to Microsoft Windows XP. The exact description of error 721 can range from PPP “The remote host is responding securely” to “The remote computer has stopped responding.”
Cause Of Error 721
Point-to-point tunneling uses Generic Routing Encapsulation (GRE) for the tunneled data. In addition, an error can occur if the Internet firewall does not allowt traffic scheme GRE. Generic Routing Encapsulation Protocol is used randomly with point-to-point tunneling to create VPNs between a web server and a client, or between satisfied clients. Obviously, this can happen even if the modem driver is not compatible with Windows XP. 
How To Fix Error 721
To fix this error, you need to configure your network so that your firewall will allow GRE 47 every time. You must also ensure that the firewall allows TCP traffic on the 1723 plug-ins. Both conditions are required to establish a virtual exclusive network connection using the point-to-point tunneling protocol.
Installing a specific Windows XP compatible driver on behalf of the Can modem also solves the problem in some situations.
This Techquack article describes how to resolve VPN error 721 that occurs when you try to establish a VPN connection through a Windows-based dial-up server.
If you are trying to install When connecting a dedicated private network (VPN) to an ideal corporate network using a Point-to-Point Tunneling Protocol (PPTP) client, connecting to a Microsoft Windows Server-based Remote Access Server may fail. You may receive the following error message:
What Are The Reasons For VPN Error 721
VPN error 721 is often a Microsoft bug that occurs immediately after an unsuccessful attempt to establish a VPN connection to the corporate network using a PPTP (Point-to-Point Tunneling Protocol) client. This error sometimes occurs after an unsuccessful attempt to establish a dial-up connection after upgrading your computer from a version to Microsoft Windows XP.
This issue can occur if the corporate firewall does not allow Generic Routing Encapsulation Protocol (GRE) traffic. GRE is IP 47. The pptp GRE is used to configure the data.
Point-to-Point Tunneling Protocol uses General Routing Encapsulation (GRE) for tunnel data. VPN error 721 can occur if the network firewall software does not allow GR trafficE. GRE is still used in conjunction with point-to-point tunneling to create VPNs between an Internet hosting server and an intermediate client or clients.
To Fix VPN Error 721
Use a third party repair service tool
A third party repair tool is a versatile power tool that will scan every corner of your PC and fix the problem if the error is found normally. It repairs corrupted registry file types, system files, problems, drivers, etc.
After someone’s computer has been recovered from a virus infection, it is recommended that you use this program to repair damage caused by a computer virus or malware attack. After optimizing your PC with this tool, you can delete a connection with a web connection error or a connection with a VPN error.
Uninstallation has continued and software and drivers have been added recently.
This problem occurs as soon as other software or The drivers are starting to use my port, which is necessary for a successful connection. To fix this problem, uninstall the software, then the drivers you just added, and then restart your computer.
Remove additional devices
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Additional devices such as Bluetooth wireless technology, keyboard and mouse, printer, gaming equipment, additional network devices may use the corresponding port and cause VPN or Internet connection error. You will also need to disconnect many USB devices in order to regain your Internet connection.
Temporarily disable your firewall
A firewall is used to block malicious connections between your computer and the Internet. If you are using Windows Firewall or third party firewall, you should turn them off first and try to connect them all to the Internet.
Repair the registry file
If there is a new invalid entry in the registry file or the Windows registry file is corrupted, most applications will prevent them from working correctly. You wellYou should recover your laptop or computer file from a backup fix or problem with a third-party recovery program.
Remove common modem configuration file and drivers
Delete the current modem configuration file via Control Panel -> Report on the program, uninstallation and installation of a new modem driver. Also uninstall any corrupted modem drivers in the same mode and then install the latest and greatest driver.
Update your Windows operating system and adapt your driver
It is necessary to update this Windows operating system and install the factor. Updating In Windows, the driver solves many problems and makes Windows faster.
Make sure many of you have recommendations
Make sure you have the correct login information and that your ISP account has not expired. Sometimes your ISP account can cause your knowledge to expire.
Check cables, modem, hardware and other types of devices
Make sure you have the correct hardware configuration Check the cable connection to your PC, the status of your modem and all hardware devices. An improperly connected plain cable will prevent you from connecting to the Internet.
Frequently Asked Questions
- Click the Start button, type Firewall and select Firewall and Network Security.
- Click the Advanced Settings button.
- Click Yes when prompted for a User Control Account (UAC).
- Select login rules.
- Open all action menus and select a new rule.
- This is usually the port type.
Online Virtual Private Channel provides secure connections (VPNs) (VPNs) between a local client and an online IT support server, usually over the Internet. When my VPN crashes, the client program logs an error, usually a number.
It may not be possible to connect to a remote computer. You may need to change the network settings for this connection.
- Use any PIA VPN.
- Change the date and time on your system.
- Set up a VPN connection manually.
- Exclude VPN in antivirus settings.
- Activate some VPN software in Windows Firewall.
- Clear the DNS / sterilizer cache.
- Reinstall the VPN Client.
- Enable general rule for PPTP.
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