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What is a VPN
A VPN (Virtual Private Network) provides an individual enterprise or entitywith a dedicated channel for its internal network resources over the publicdomain of the Internet. VPN first used PPTP / L2TP for its communications protocol, but the channel lacked an encryption mechanism and was therefore less secure. Later developments, such as IPsec VPN and L2TP Over IPsec VPN, provided channels of better security; yet, complicated settings made it inconvenient to use them.
The SSL VPN was adopted later for its easier access to network resources. Convenience. The user can sign in and easily establish a secure channel through the HTTPS protocol, to corporate network resources or units, provided that the client browser supports SSL. Using the HTTPS protocol, the user will not be too limited to a strict network environment to use VPN.

When to use VPN
When you are not in STUST but need to use network resources that are only available in STUST, you will need to log in to the VPN. For example, you need to use the electronic database by purchased the school library and available only in STUST, you can log in to the STUST VPN and use the campus IP to access the database. If you need to access any PC with a virtual IP PC, you can log in to the STUST VPN and access your PC via such protocol as Remote Desktop.

How to log in the STUST VPN and the installation steps
(Currently the CINC recommends that users use https://vpn2.stust.edu.tw .)
(1) Log in to https://vpn2.stust.edu.tw or https://vpn.stust.edu.tw. Please enter your STUST email account number and password.
(2) If you are using Microsoft IE, please follow the installation steps listed in the attached file to install the related software.
(3) 4 hours after you log in, you will be automatically logged out. Please log in again if necessary.
(4) Please log out If you do not need any VPN service. It will help improve the quality of the network connection. 

Link: http://sites.stust.edu.tw/network/vpn