Enabling OWA (Outlook Web Access) to Exchange server
03/26/2020 45 18231
DESCRIPTION: This KB article covers how to access an OWA server behind a SonicWall appliance.
CAUSE: Outlook Web Access is a component of Exchange Server which allows users to connect remotely via Web browsers. OWA is used to access e-mail, calendars, contacts, tasks and other mailbox contents while on the go. Outlook Web Access uses standard HTTP and HTTPS protocols to display Web pages.
Outlook Web Access may be enabled for remote users when the Exchange Server is located behind the LAN interface of a SonicWall security appliance by creating firewall access rules (and NAT policies for SonicWall appliances running SonicOS Enhanced firmware) permitting HTTP and HTTPS traffic to reach the server. Follow these steps:
1. Create a service group for the required ports
2. Create an address object for the Exchange server
3. Create a rule to allow access from WAN to LAN and select OWA service group as the service
4. Create a NAT policy to forward traffic from the WAN IP to Exchange server Private IP and select the OWA service group as the service.
5. If users on the LAN need to access OWA, using the public IP, create a loopback NAT policy to allow access to the Exchange server via the public IP address