Nowadays, a lot of companies need to publish resources through the Internet. You can think about the e-mail environment, certain websites, customer relationship management, and so on. Citrix NetScaler can help companies arrange this using the reverse proxy methodology. Citrix NetScaler will be the proxy between the Internet and the company network. So basically, the servers can be in the LAN network and Citrix NetScaler will be placed in the DMZ zone. This will perform a secure connection.
With the reverse proxy functionality, it's also possible to perform a trusted and secure connection from outside by using an SSL certificate, and from Citrix NetScaler, this can be done using a single HTTP connection. This has an advantage; there is no change necessary on the server.
Lately, Citrix NetScaler has been used a lot for the reverse proxy functionality, because of the end-of-life from Microsoft TMG. Microsoft TMG was a reverse proxy that was used a lot for the Microsoft Exchange...