Knowledgebase

Additional Viscosity licenses
Unfortunately we can issue only 1 free license per 12VPN purchase. You can purchase additional...

Changed OpenVPN password, now it doesn't work anymore.
OpenVPN pass-phrase What you've probably done is add a password to the security certificate:...

Clearing your browser cache
Wikihow has an excellent article explaining how to clear your browser cache:...

DNS poisoning
Windows Some governments may use DNS poisoning to block websites. If you try to access a blocked...

Everything is so slow when using VPN
Although using a VPN adds some overhead to your Internet traffic, this should not be noticeable....

I use OpenVPN, but UDP is blocked
All UDP ports are blocked. This prevents OpenVPN from working. Solution We offer TCP...

Installing Shrew on Windows XP
Please download an up-to-date STABLE version of Shrew from: http://www.shrew.net/download/vpn...

iPhone: Cisco setup
iPhone Cisco profile Pre-requisites 12vpn.cer and vpnservices.cer root certificates as well...

Maemo: OpenVPN setup
  Installing OpenVPN Start the Application Manager and select Download. Open the top...

OpenVPN and Norton Personal Firewall
Norton/Symantec Personal Firewall is one of the more problematic ones when it comes to running...

OpenVPN error: All TAP-Win32 adapters on this system are currently in use.
This error occurs when the TAP-Win32 network adapter has been disabled. Or when another copy of...

OpenVPN error: TLS Error: local/remote TLS keys are out of sync
This error occurs when either side of the VPN (you or the server) restarts the connection...

OpenVPN error: TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
In most cases this means a firewall is blocking the VPN connection. If you're running a firewall...

OpenVPN error: Unrecognized option or missing parameter(s) in xxxxxxxx.ovpn:1: connection (X.X)
You're using an outdated version of OpenVPN. Please download a newer version of OpenVPN. For...

OpenVPN error: Warning: route gateway is not reachable on any active network adapters
Windows XP: disabling NetBIOS Open your Control Panel Open the Network Connections window...

OpenVPN error: Warning: route gateway is not reachable on any active network adapters: x.x.x.x
This error is typically caused by problem with Windows IP subsystem. The subsystem can be reset...

OpenVPN error: write UDPv4: Can't assign requested address (code=49)
Mac OS/X In some situations where OS/X tries to deal with changes to it's Internet connection it...

OpenVPN on DD-WRT
Note: OpenVPN requires quite a bit CPU power - something which most DD-WRT routers don't have a...

OpenVPN with AVG Anti-Virus
A customer using AVG reported: I've got an Anti Virus Scanner, AVG AntiVirus 10.0, that contains...

OpenVPN: Creating a firewall exception on Windows XP
If OpenVPN is not added as an exception to your firewall, it will not be able to create...

OpenVPN: creating a split configuration
NOTE: Creating a split configuration requires familiarity with the Command Prompt of your...

OpenVPN: Using higher priority to boost performance.
In some situations the following procedure can provide a small performance boost. Note: editing...

PBK files are being opened by Adobe Pixelbender
Unfortunately Adobe overrides the default file association for Microsoft Phonebook files. These...

Selecting which VPN type to use
Mobile users If you're a mobile user, or plan to travel, we recommend you configure all...

Sending e-mail
Sending e-mail is usually done using the SMTP protocol. Depending on the situation, SMTP uses TCP...

Setting up on Blackberry
While BlackBerry can connect to the VPN, the number of applications that can use the VPN are VERY...

Symbian S60: Nokia Mobile VPN
Contents   Prerequisites Important to know Install Nokia Mobile VPN Install 12vpn VPN...

Tunnelblick problem: wrong password stored in keychain
  This article explains how to remove the Tunneblick saved passwords from your Keychain....

Using McAfee with OpenVPN
When using McAfee with OpenVPN, your connection may not work properly. The cause of the issue is...

Viscosity/Tunnelblick: blue screen on start-up after install
It's possible that the TUN/TAP drivers are causing your Mac to get a blue screen on start up. The...

Vista: not enough permissions
If your program needs Administrator permissions, you can right-click its icon and select "Run...

Windows Mobile: L2TP setup
Windows Mobile 6, using PPTP Go into Settings and select Connections. Select Add new VPN...

Windows Mobile: PPTP setup
Windows Mobile 6, using PPTP Go into Settings and select Connections. Select Add new VPN...

Windows XP / 2000: PPTP VPN uses wrong DNS
Please see this article: http://support.microsoft.com/default.aspx?scid=kb;en-us;311218 Don't...