You might be on a network that is blocking the Tor network, and so you should try using bridges. Some bridges are built in to Tor Browser and requires only a few steps to enable it. When you open Tor Browser for the first time, click "Tor Network Settings". Under the "Bridges" section, select the checkbox "Use a bridge", and choose the "Select a built-in bridge" option. From the dropdown, select whichever pluggable transport you'd like to use. Once you've selected the pluggable transport, scroll up and click "Connect" to save your settings.

Or, if you have Tor Browser running, click on "Preferences" (or "Options" on Windows) in the hamburger menu (≡) and then on "Tor" in the sidebar. In the "Bridges" section, select the checkbox "Use a bridge", and from the option "Select a built-in bridge", choose whichever pluggable transport you'd like to use from the dropdown. Suas configurações irão ser automaticamente salvas uma vez que você fechar a aba.

Se você precisar de outras pontes, você pode obtê-las em nosso site Bridges. Para mais informações sobre pontes, consulte o Manual do Navegador Tor.