Scroll down to the bottom of the list to find the 'Security' sectionĬonfirm 'Use TLS 1.2' is enabled (Figure 2) Launch the Internet Properties panel (Figure 1) Type 'Internet Options' in the search bar Press 'Win+I' to launch the Windows Settings panel Please confirm that TLS 1.2 is enabled in your system using the following procedure: Please do a fresh reinstallation with the offline installer: Have your IT Support check if antivirus/firewall applications could be stopping necessary network traffic. Please have your IT support check that the addresses and ports indicated in this Knowledge Base article are open in your network:Ģ,) VIRUS PROTECTION AND FIREWALL SETTINGS 'Error from : Server SSL certificate is invalid Starting in Version: 18.0 'Error from : A secure channel could not be established' or 'Error from : The attempt to connect to the server failed' or 'Error from : The server name could not be resolved' or I am receiving an error message when I try to sign in to Altium designer.

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