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The XG Series hardware appliances will reach end-of-life (EOL) on March 31, 2025. Click here to see the XG to XGS migration documentation.

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https://docs.sophos.com/nsg/sophos-firewall/21.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=authentication-server-TACACS

TACACS+ server

Terminal Access Controller Access Control System, is a proprietary protocol offered by Cisco Systems. It provides detailed accounting information and administrative control over authentication and authorization processes.