Internet, Networking, & Security VPN How to Fix Client and Server-Side VPN Error 800 by Bradley Mitchell Writer An MIT graduate who brings years of technical experience to articles on SEO, computers, and wireless networking. our editorial process LinkedIn Bradley Mitchell Updated on November 15, 2019 Tweet Share Email VPN Browsers Cloud Services Error Messages Family Tech Home Networking 5G Antivirus VPN Web Development Around the Web View More 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. VPN error 800 "Unable to establish the VPN connection" is a common problem that occurs when you work with virtual private networks. Unfortunately, this error code doesn't explain why the connection is failing. What Causes VPN Error 800 Kaveh Kazemi / Getty Images Error 800 occurs when you are trying to establish a new connection to a VPN server. It indicates that messages being sent by the VPN client (you) are failing to reach the server. Many possible reasons for these connection failures exist including: The client device lost the connection to its local networkThe user specified an invalid name or address for the VPN serverA network firewall is blocking the VPN traffic How to Fix VPN Error 800 Check the following to address any potential reasons for this failure: Confirm that the network connection between the client and server is functioning properly. 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.Use the correct VPN server name and address. The name a user enters on the client side must match the server name set up by a VPN administrator. Given a choice, users can opt to specify an IP address instead of a name. It's more common to mistype an address than a name, however. VPN servers may also have their IP address changed occasionally, especially DHCP networks.Make sure your firewall isn't blocking VPN connections. To determine whether a client firewall is triggering 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 is using—usually TCP port 1723 and IP port 47 for Microsoft Windows VPNs. Home network administrators normally perform these changes on a broadband router.If you have never connected with the local router you are using, the router may need a router firmware update to be compatible with the VPN. If it has worked with the VPN previously, this isn't the problem. The server may have too many clients already connected. Server connection limits vary depending on how the server is set up, but compared to other possibilities, this is an uncommon problem. You can't check this from the client side of the connection. The server may be offline, in which case, the delay in connecting should be a brief one. How to Hide Your Identity and Data on the Web With a VPN Was this page helpful? Thanks for letting us know! Get the Latest Tech News Delivered Every Day Email Address Sign up There was an error. Please try again. You're in! Thanks for signing up. There was an error. Please try again. Thank you for signing up. Tell us why! Other Not enough details Hard to understand Submit