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How to Fix Client and Server-Side VPN Error 800

In this guide, we'll explain how to fix client and server-side VPN error 800

A Virtual Private Network provides a secure connection between a local client and a remote server over the internet. When you attempt to connect to a VPN and cannot, you receive a VPN error message. There are hundreds of possible error codes, but only a few are common.

What Causes VPN Error 800

Unfortunately, the error code in question does not properly explain what stands behind the problem.

The possible causes might be:

  • A network firewall is blocking the VPN traffic
  • Conflicting software
  • Network issues
  • Wrong server names or addresses

This list is not limited, so make sure to give all the troubleshooting steps below a try – no possible culprit should be neglected.

How to Fix the VPN error 800?

To help you, we have prepared an exhaustive guide that contains all the possible information on how to deal with the VPN error 800 on Windows 10 in the most effective way.

Check Network Connection Between the Client and Server

You can attempt to ping the server if you aren’t sure, although VPN servers can be configured to ignore ICMP requests. Retrying the connection after waiting a minute or two can work with sporadic network outages. Attempting a connection from a different client device can also help pinpoint whether the connectivity issue is specific to one client or if it is a widespread problem.

Also read: How To Watch Netflix With NordVPN In Or Outside The US

Check Your VPN Server Name, Address and Password

Make sure your VPN name and address are correct – they should match the ones set by your VPN administrator. The point is, you might have accidentally mistyped them. Besides, some VPN servers occasionally change their addresses.

Make Sure Your Firewall isn’t Blocking VPN Connections

To determine whether a client firewall triggers VPN error 800, temporarily disable it and retry the connection. Firewall-related failures indicate a need to update the firewall configuration with additional settings specific to the port numbers the VPN on that network uses—usually TCP port 1723 and IP port 47 for Microsoft Windows VPNs.

Flush Your DNS Cache

VPN connection errors often stem from a corrupted DNS cache. So, try flushing it to fix your issue:

Press the Windows logo key + X shortcut on your keyboard
Select Command Prompt (Admin) from the list of options
Input the following commands separately:

netsh interface ip delete arpcache
ipconfig /flushdns
ipconfig /renew

  • Exit your Command Prompt and restart Windows
  • Check if you can connect to your VPN now

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Diekola Yusuf
Diekola Yusuf
Founder & CEO of Novabach - Yusuf is a Tech enthusiast. Fascinated by Computers and all sorts of Technology. He writes news, updates, walkthroughs, guides, troubleshooting tips, and how-to tutorials on gadgets and consumer electronics.
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