Barracuda Networks SSL VPN, Administrator'S Manual

Page: 69 / 124

Advanced Configuration 69
Prerequisites
The following is required:
• Trusted Certificate : You must have a trusted certificate installed or alternatively each client
must trust the certificate by adding it to the Internet Explorer trusted certificate authorities’
store.
• HTTPS Proxy hostname : The HTTPS proxy configured within Outlook must match that of the
certificate used by the Barracuda SSL VPN. If the appliance is set up with a trusted certificate
for the host vpn.example.com then this must be entered exactly into Outlook configuration for
HTTPS otherwise Outlook will not connect to the appliance.
• NTLM Authentication : The RPC proxy will only work with Outlook clients that authenticate
over NTLM.
Configuring the Barracuda SSL VPN as a RPC Proxy
Browse to the Outlook configuration settings under Manage System > Advanced > Configuration.
From here the Exchange server can be specified, along with the associated port and the protocol to
use to communicate with Exchange. In addition all policies that have access to this feature can be
added. To add a policy, simply select the available policies from the Authorized Policies list.
Users of any policies not part of the Selected Policies window will not have the ability to use Outlook
over HTTPS.
Client Configuration
The final step in the configuration is that of the email client Outlook. Each user can either add a new
profile to an existing account or as the following details; a new email account is created. Either way,
the main steps are the same and relevant to both.
1.
1.From the Windows Control Panel, access the Mail setup by selecting the mail icon.