UDP connections, for example in many VoIP applications, and ICMP connections,
for example in the `ping` utility, cannot go through the Tor network and are
blocked in Tails.

UDP connections, for example in many VoIP applications, and ICMP connections,
for example in the `ping` utility, cannot go through the Tor network and are
blocked in Tails.

The same list is also available from the Persistent Storage settings, by clicking on the
[[!img lib/emblem-system.png class="symbolic" link="no"]] button of the <span class="guilabel">**Additional
Software</span>** feature.

The same list is also available from the Persistent Storage settings, by clicking on the [[!img lib/emblem-system.png class="symbolic" link="no"]] button of the **Additional Software** feature.

Correct the ownership and permissions of your additional `sources.list` files to be owned by `root` and only readable by others. For example:, execute the following commands.

Correct the ownership and permissions of your additional `sources.list` files to be owned by `root` and only readable by others. For example, execute the following commands.