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<p>Tails uses the [[default <i>obfs4</i> bridges from <i>Tor
Browser</i>|https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/blob/main/projects/tor-expert-bundle/pt_config.json?ref_type=heads]].</p>
 
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<div class="note">
 
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Tails tries to connect to Tor using one of the **default bridges**, already included in Tails, if connecting using public relays fails.
 
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Tails tries to connect to Tor directly using **public relays**, without using a bridge.
 
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Then, Tails tries different ways of connecting to Tor until it succeeds:
 
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For detailed instructions, see how to [[sign in to the network using a
captive portal|unsafe_browser]].
 
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If Tails fails to synchronize the clock because you have to sign in to the network using a captive portal, an error screen is displayed that helps you do so.
 
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If you choose instead to [[hide that you are connecting to Tor|tor#hiding]],
you might have to fix the computer clock manually.
 
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</div>
 
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<p>You can learn more about our security assessment of this time
synchronization in our [[design documentation about non-Tor
traffic|contribute/design/Tor_enforcement#non-tor-traffic]].</p>
 
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<div class="next">
 
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First, Tails synchronizes the clock of the computer automatically, because a correct time is needed to be able to connect to the Tor network.
 
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When you choose this option:
 
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We recommend connecting to Tor automatically if you are on a public Wi-Fi network or if many people in your country use Tor to circumvent censorship.
 
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Tor bridges are often less reliable and slower than public Tor relays.
 
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It does so by camouflaging your connection so it cannot be recognized as a
connection to Tor. As a consequence, the same technology can be used to hide
that you are using Tor if it could look suspicious to someone who monitors
your Internet connection.
 
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The technology used by Tor bridges is designed to circumvent censorship
where connections to Tor are blocked, for example in some countries with heavy censorship,
by some public networks, or by some parental controls.
 
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Use a bridge as your first Tor relay if connecting to Tor is blocked or if
using Tor could look suspicious to someone who monitors your Internet
connection.
 
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Using a public Tor relay as your first Tor relay makes it clear to your local
network that you are connecting to Tor, while still keeping your online
activity secure and anonymous.
 
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Most of the time, your local network does not block access to the Tor network
and you can use a public relay as your first Tor relay.
 
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