https://community.sophos.com/utm-firewall/f/general-discussion/142682/sophos-sg-webserver-reverse-authentication-not-working-exchange-owaHello, We are using a Sophos SG and wanted to publish an OWA page from the Exchange Server and secure it via reverse authentication. If we configure the virtual as well as the real web server on port 80, the reverse authentication works and the Sophosen-USTelligent Community 12https://community.sophos.com/thread/531762?ContentTypeID=1Wed, 08 Nov 2023 10:24:30 GMT4be5eb7d-caa4-4ff5-8e60-8f9463545a35:8115882b-3a95-42f2-8c61-2995b82d3a10Vivek Jagad<p>Hello <a href="/members/admin_5f00_idl">admin_idl</a>&nbsp;,<br /><br />Thank you for reaching out to the community, ensure&nbsp;that no other services run on ports 80 or 443 on Sophos UTM. To&nbsp; check if the WAF network socket is listening on ports 80 or 443 by running the command below:&nbsp;<strong>netstat -naltp | grep -E &#39;:80|:443&#39;</strong></p><div style="clear:both;"></div>