Q: What is VPN?
A: VPN (Virtual Private Network) is general name given to network or connection, which created inside or on top of another network such as the Internet. With this term, usually referred to a created protected network or tunnel inside the insecure Internet. In its simplest form VPN is a tunnel from a VPN-client, installed on the PC and the VPN-server. Inside of this tunnel, using a VPN establishes protection, encryption, and change data exchanged between the the user's computer and the websites or webservices on the Internet.
Q: Why do you need it?
A: In some cases, the VPN needs to be 'anonymous' the network that is hide your real IP address. In others cases in order to access to resources a connection to that are closed for your IP address. Another option is to increase common security of surf on the Internet through encryption of user's traffic. VPN services are tunneling all Internet traffic and hide everything that passes through the tunnel from prying eyes, they can be used for e-mail, instant messaging, VoIP and other Internet services, in addition to web-browsing. And that's not all, there are a lot of options of using and applying VPN.
Q: How VPN works?
A: Usually, when you connect to the Internet, between you and the network always exist one or two members, it may be your ISP, or a public wireless access point. In these cases, information from you to your ISP, or to a public hotspot, or any another point on the way to Internet resources is unencrypted. That is, you enter your username and password and these are available to all points your connection goes through. All of your correspondence, all Internet pages have visited are available to at least the ISP, as well as any other party that had connection to your chain of connections. When you establish a connection to the VPN server, the server which you are connected to, giving you access to Internet resources. All this information again passes through your ISP or any other hotspot, but in an encrypted form on virtual channel created between the server and your computer. Further it is server that you you have performed the connection starts surf at the network on your behalf.
Q: How is assured data security and how reliable a VPN?
A: At the moment of your computer is connected via VPN to the server between your computer and the server begins something like a roll call. Simplistically, the server asks random questions, your computer gives random answers. When forming the key, that will encrypt the connection, and that will use your computer and the server,, have the value these random factors: random question, the answer of your computer, response time, your operating system, since all this is taken into account when creating the key. This set of factors is unique. The key to the encryption of data created on your computer and the server at some point can be used only by them, and only during this connection. Any a malicious user to decrypt the selection method will have to repeat all of these random factors, it is almost impossible, and it means that the logic of decoding cab't be repeated by an attacker. This is a simplified description of the encryption process, but in general it looks like this..
Q: What can offer a VPN for business?
A: VPN remote access connection gives users the ability to work at home or on the road, that is, to get access to the private network server using the public network infrastructure, such as the Internet. From the user perspective, VPN-connection is a connection type 'point-to-point' between the computer (VPN-client) and the company's server . Real infrastructure shared or public network is irrelevant because the data transmitting just as if they were transmitted over a dedicated private channel.
VPN connection type 'net-to-net' enables organizations to establish routed connections between separate offices (or between other institutions) in the public network, while providing security of communication. Routed VPN connection over the Internet is logically like a dedicated channel of the global network (WAN).
Therefore, a VPN can pool resources (servers and workstations) on a single secure virtual network, created on the basis of the Internet.
Thus, employees working remotely (from home or from another country) will be located as though in the public network of the company. VPN is suitable for consolidating geographically separated offices.
Q: How to log in user on the VPN servers?
A: Log in to the VPN server occurs by login and password. Entering the login and password can be automated, so you will not have to enter it every time to connect.
Q: Can I simultaneously connect two PCs to the VPN server?
A: You can't do it, in the case of simultaneous connections. In implementing two simultaneous connection to the server, one of connections will be automatically turn off. But if you have a computer network, you can organize connection to VPN server from one of computers, and other computers can simply connect to the Internet through the computer, or you can set up a connection to the VPN server through your router (if the router support VPN session).
Q: I connect to the Internet via GPRS, can I connect to the VPN server?
A: Connect to the VPN, you can by using OpenVPN. Through the PPTP connection mostly impossible since the GSM operators ussually block GRE-packets, although there are exceptions to the rule.
Q: Can I connect to the VPN behind a proxy server or through the firewall?
A: Yes, you can. VPN service can be used if allowed TCP-connection on port 443 (HTTPS protocol). Standard firewall settings allow HTTPS traffic.
Q: Can I use a mail client on your VPN network?
A: No, you can't. Our network banned all outgoing TCP connections on port 25 (SMTP). This is a necessary measure to counteract spam. But you can use the browser to work with mail through Web-interface.
Q: What is OpenVPN?
A: OpenVPN is an open-source software application that implements virtual private network (VPN) techniques for creating secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It uses a custom security protocol that utilizes SSL/TLS for key exchange. It is capable of traversing network address translators (NATs) and firewalls.
Q: The connection is not established, what should I do?
A: If you use a local firewall, you should turn it off. If you use OpenVPN GUI-client, try to run the application as an administrator.
For the diagnosis of problem on Windows, please contact support with following information: the contents of the log-files from OpenVPN log file directory, the output of the route print command and the output of the ipconfig command.
For the diagnosis of problem on Linux, please contact support with following information: the result of the command route -n; the output of the ifconfig command and the result of the command grep -i openvpn /var/log/messages.
Q: I need to use VPN on your smartphone (android), what I need to do?
A: You need to download keys to your smartphone, install and configure the application for VPN connection of and connect it. Maybe for the application and the connection will require root rights on your smartphone.
Q: How do I know which OpenVPN error occurred?
A: The application OpenVPN has connection log. When you connect to VPN server application records data connection. This information will not transfer anywhere and remains on your computer, so you can determine the cause of the error. To invoke the log window, double-click the left mouse button on the OpenVPN icon in the system tray.
Q: I can not select the 'Connect' by clicking on the icon in the system tray.
A: If the list includes only the 'Proxy Settings', 'About' and 'Exit', but there is no 'Connect',
It means that you didn't download and/or copy configuration file 'client.ovpn' in 'C:/Program Files/OpenVPN/config'. Open the instructions for setting up OpenVPN connection for your operating system and check all the steps installation and configuration.
Q: Connect to IP:Port failed, will try again in 5 seconds; No Route to Host
A: This error means that you don't have an Internet connection, or it blocks by Firewall or Anti-Virus. Check is your Internet connection active, disable Firewall, Anti-Virus and try to connect again.
Q: Cannot load certificate file client.crt
A: This error related to the absence certification of files in a folder 'C:Program FilesOpenVPNconfig'. During the installation process was necessary to download the file with certificate and extract it to the folder with the application. Open the instructions for setting up OpenVPN connection for your operating system and check all the steps installation and configuration.
Q: All TAP-Win32 adapters on this system are currently in use
A: This error is caused by incorrect operation of Windows and applications OpenVPN. Besides, the error can also occur as a result of tripping off the Internet without first OpenVPN disconnection. Always disconnect the OpenVPN first and only then the Internet. To resolve this issue, go to 'Start -> Network Connections', find 'LAN Connection', 'TAP-Shyn32 Adapter' and right-mouse-click on the label. Select 'Disable', and then, in the same way 'Enable' the connection. After completing these actions VPN connection problems should be gone.
Q: ERROR: Windows route add command failed: returned error code 1
A: This error is related to the restriction of the rights in Windows. To resolve this error, you must exit OpenVPN GUI. Right-mouse click on the icon OpenVPN GUI on your desktop and select 'Properties' tab 'Compatibility' check 'Run this program as an administrator'. Now run the OpenVPN GUI again and try connect to the VPN.
Q: Initialization Sequence Completed With Errors
A: This error is caused by malfunction of the DHCP because of antivirus or firewalls. The error occurred in some firewalls, also seen in Kaspersky Anti-Virus. The following is a solution for Kaspersky Anti-Virus. The algorithm is the same as solving the problem on other antivirus and firewalls. To resolve this problem, you should go to 'Start -> Control Panel -> Network Connections' and go to 'Properties' virtual adapter 'TAP-Win 32 Adapter'. At the 'General' tab in the list disable the Kaspersky Anti-Virus NDIS Filter, and then click 'OK'. Now connect to the VPN and the connection should be successful/
Q: TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
A: The most common error, there are many options.
a) Make sure you have an correct version of OpenVPN, download keys again.
b) There is an Internet connection, but it doesn't work.
c) Installed protection that blocks this application.
Q: AUTH: Received AUTHFAILED control message
A: Invalid authorization, check the login and password.
Q: Initialization Sequence Completed With Errors
A: Error assigning an IP address to the adapter. In this case, check that there is automatic assignment of IP to TAP adapter, if everything is configured correctly, then to one of your connections (possibly hidden/remotely) has assigned an IP subscription, change it for example to 192.168.238.238 or any other unused.
Q: connect failed, will try again in 5 seconds: Connection timed out
A: There are several possible causes:
- OpenVPN connection ports closed at the level of ISP;
- connection of OpenVPN application is limited by the firewall;
- OpenVPN server unavailable;
Solution: check the availability of the VPN server, first. You can use the ping command for that.If there is no communication with the server you should contact the support. If there is a connection, it is necessary to ensure that the application is not blocked by software installed on your computer. To checkit, disable the firewall for a while the firewall, and then try to connect. If access isn't available, then most likely that the OpenVPN is blocked at the level of ISP and for providing the services to you will be necessary change the settings of OpenVPN servers.