Barracuda Networks NG Network Access Client SP4 Administrator's Manual page 135

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When use of a proxy server has been defined at profile creation time (10.6 Barracuda
Networks Control / Preferences Dialog, page 137), then this checkbox will be selected by
default,
time. If the proxy server requires a password, you need to insert it into the respective field.
You can make use of the proxy server checkbox to override settings that have been defined at creation time of the
profile. In certain cases you might want to define use of a proxy server though the profile settings do not require this
(or vice versa), or you might need to use another proxy server than the configured one. The overriding option is
especially useful if a user does not have administrator rights is therefore not able to change profile settings in general.
Click to establish a connection to the VPN server.
Connect
133 Barracuda NG Network Access Client - Administrator's Guide
Use a proxy server to connect
and
User/Password Proxy Server
checkbox
will be displayed in the fields below at the same