This message was sent to Palo Alto Networks customers: Dear valued Palo Alto Networks customer, Please take the action recommended below if you have enabled SSL decryption forward proxy. This is required for users to access Gmail and other websites and applications using web browsers that implement strict TLS 1.3 compliance. We have been informed that Google Chrome is planning to implement strict TLS 1.3 compliance in their upcoming version 72. The stable build of Google Chrome version 72 may be available in January 2019, and if your users use a pre-stable build of Google Chrome, they will experience the issue outlined below earlier. Applies to All supported PAN-OS releases Action Required If you run PAN-OS 8.1: Upgrade to PAN-OS 8.1.4 (available now) If you run a prior version of PAN-OS, plan to upgrade to one of the following releases: PAN-OS 8.0.14 (targeted to be available on Nov 15, 2018*) PAN-OS 7.1.21 (targeted to be available on Nov 1, 2018*) Impact Without upgrading to one of the above maintenance releases, users may no longer be able access Gmail and other websites and applications that utilize TLS 1.3 when SSL forward proxy decryption is in use. As a result, your users will receive the following web browser error: ‘ERR_TLS13_DOWNGRADE_DETECTED’. By upgrading PAN-OS to one of the above maintenance releases, your users will be able to continue to access Gmail and other TLS 1.3 enabled websites and applications when using browsers that exhibit this behavior.
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