# isAuthenticated `true` once any successful `AUTHENTICATE` (or pre-auth construction) has marked this client ready. ``` var isAuthenticated: Bool { get } ``` ## Discussion Becomes `true` after the first successful [`authenticate(password:)`](/documentation/Tor/TorControlClient/authenticate(password:)) call or after [`init(fileDescriptor:preAuthenticated:dataDirectory:)`](/documentation/Tor/TorControlClient/init(fileDescriptor:preAuthenticated:dataDirectory:)) with `preAuthenticated: true`. Never reverts to `false` within a single instance — discard the client and construct a new one to re-authenticate a socket from scratch. > Note: Reads race-safely with a concurrent > ``doc://Tor/documentation/Tor/TorControlClient/authenticate(password:)``; the underlying flag is > `Mutex`-guarded (SE-0410).