Advanced Configuration 69PrerequisitesThe following is required:• Trusted Certificate: You must have a trusted certificate installed or alternatively each clientmust 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 thecertificate used by the Barracuda SSL VPN. If the appliance is set up with a trusted certificatefor the host vpn.example.com then this must be entered exactly into Outlook configuration forHTTPS otherwise Outlook will not connect to the appliance.• NTLM Authentication: The RPC proxy will only work with Outlook clients that authenticateover NTLM.Configuring the Barracuda SSL VPN as a RPC ProxyBrowse 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 touse to communicate with Exchange. In addition all policies that have access to this feature can beadded. 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 Outlookover HTTPS.Client ConfigurationThe final step in the configuration is that of the email client Outlook. Each user can either add a newprofile 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.
