![]() ![]() If you want to bypass SSL/TLS inspection, you can use the local TLS exclusion list to allow the domains. If an error message is shown, it may not show an identifiable reason. Websites and browsers that use certificate pinning block the requested page fully or partially when SSL/TLS inspection is turned on. To edit this list, go to Web > URL groups. You can add websites to this list by troubleshooting in the Control center or Log viewer. Local TLS exclusion list: The list is empty by default. The exclusion rule contains the following default exclusion lists: SSL/TLS inspection rules are evaluated top down in the rule table. The rule is permanently positioned at the top of the SSL/TLS inspection rule table. The rule has action set to Don't decrypt and the decryption profile set to Maximum compatibility. Sophos Firewall provides a default exclusion rule, Exclusions by website or category, that prevents connections to certain websites from being decrypted. Apply web content policies to encrypted traffic to prevent unwanted uploads and downloads without obstructing general browsing. ![]() Prevent malware transmission through encrypted traffic.Implement policy-driven decryption and meet compliance requirements.You can use SSL/TLS inspection rules in these cases: ![]() After decrypting and inspecting the traffic, Sophos Firewall re-encrypts the traffic with the re-signing certificate authority that you specify. You need to select a decryption profile for each rule to specify the action for traffic with issues, such as insecure protocol versions, SSL compression, unrecognized cipher suites, cipher algorithms to block, certificate errors, or connections that exceed the firewall's decryption capabilities. For the rule to take effect, it must find a match in all the specified criteria. You can specify rules to decrypt traffic based on the source, destination, users and groups, services, websites, and web categories. Inspection rules apply to detected SSL/TLS connections. SSL/TLS inspection detects SSL/TLS traffic on any TCP port. Position the specific rules above the less specific rules. Once it finds a match for the packet, it doesn’t evaluate subsequent rules. Sophos Firewall evaluates rules from the top down until it finds a match. To change the position of a rule, click and drag the Rule handle ( ). To turn on or turn off a rule, select the switch.To clone or add a rule next to an existing rule, select the action.To edit or delete a rule, select the action.To reset the rule filter, select Reset filter.Ĭlick More options to specify the following actions:.You can filter the rules by the source, destination, and rule ID.Certificates signed by a trusted CAĪfter decryption and inspection, Sophos Firewall signs these certificates as the CA, allowing users to determine that the original issuing authority is a trusted CA and that SSL/TLS inspection has taken place. It doesn't re-sign these certificates as the CA, and clients (example: browsers) continue to see these as self-signed certificates.īrowsers then show a warning that the website's certificate wasn't issued by a trusted CA, allowing users to see that the original certificate's self-signed and must not be trusted. For these connections, Sophos Firewall only replaces the key in the certificate with the key used to re-encrypt the decrypted and inspected content, and signs the certificate with this key. Self-signed certificates allow end-to-end encryption but don't guarantee the website's identity. Some servers use a self-signed certificate instead of a certificate signed by a CA. Self-signed versus trusted CA certificates Self-signed certificates We recommend creating an SSL/TLS exclusion list for all Android devices. You can turn them on or off manually.Īndroid devices are known to generate SSL/TLS certificate errors, causing decryption to fail. For deployments migrating from SFOS 17.5 and earlier, they're turned off by default. SSL/TLS inspection rules are turned on by default for fresh installations. By default, Sophos Firewall uses the DPI engine, applying SSL/TLS inspection rules to traffic matching the firewall rule criteria. You specify the method of web filtering (web proxy or the DPI engine) in firewall rules. SSL/TLS inspection rules don't affect the decryption of traffic handled by the web proxy. You can enforce policy-driven connections and decryption for SSL/TLS traffic based on the traffic and risk level. SSL/TLS inspection enables the prevention of malware transmitted through encrypted connections. With SSL/TLS inspection rules, you can intercept and decrypt SSL and TLS connections over TCP, allowing Sophos Firewall to enforce secure connections between clients and web servers. Your browser doesn’t support copying the link to the clipboard. ![]() It will remain unchanged in future help versions. Always use the following when referencing this page. ![]()
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