The Client DPI-SSL deployment scenario typically is used to inspect HTTPS traffic when clients on the LAN browse content located on the WAN. In this scenario, the firewall typically does not own the certificates and private keys for the content it is inspecting. After performing DPI-SSL inspection, the appliance re-writes the certificate sent by the remote server and signs this newly generated certificate with the certificate specified in the Client DPI-SSL configuration. By default, this is the firewall certificate authority (CA) certificate, but a different certificate can be specified. Users should be instructed to add the certificate to their browser’s trusted list to avoid certificate trust errors.
For a re-signing certificate authority to successfully re-sign certificates, browsers have to trust the certificate authority. Such trust can be established by having the re-signing certificate imported into the browser's trusted CA list. This article covers how to install the default SonicWall DPI-SSL certificate in modern browsers. Before reading further please download the default DPI-SSL certificate from the SonicWall.
Download the Default DPI-SSL certificate:
Navigate to Manage | Decryption Services | DPI-SSL/TLS Client.
Select the Certificate tab.
Select the appropriate certificate and then click Download.
To import the certificate into a browser, perform the following:
Internet Explorer: Go to Tools |Internet Options, click the Content tab and click Certificates. Click the Trusted Root Certification Authorities tab and click Import. The Certificate Import Wizard will guide you through importing the certificate.
Firefox: Go to Tools | Options, click the Advanced tab and then the Encryption tab. Click View Certificates, select the Authorities tab, and click Import. Select the certificate file, make sure the Trust this CA to identify websites check box is selected, and click OK.
Chrome: Go to Settings | Advanced | Manage Certificates. Select the tab Trusted Root Certification Authorities and click Import. Browse for the DPI-SSL Certificate and place it in the Trusted Root store. Once complete close the browser and re-launch. Depending on the operating system a restart may be required.
Mac: Double-click the certificate file, select Keychain menu, click X509 Anchors, and then click OK. Enter the system username and password and click OK.