New release candidate: Tor

by nickm | February 1, 2021

There's a new release candidate available for download. If you build Tor from source, you can download the source code for from the download page on the website. Packages should be available over the coming weeks, with a new alpha Tor Browser release in the coming week.

We think this is almost ready to be stable: please test it out, and let us know on the bugtracker if there are any major problems!

Tor is the third release candidate in its series. We're coming closer and closer to a stable release series. This release fixes an annoyance with address detection code, and somewhat mitigates an ongoing denial-of-service attack.

We anticipate no more code changes between this and the stable release, though of course that could change.

Changes in version - 2021-02-01

  • Major feature (exit):
    • Re-entry into the network is now denied at the Exit level to all relays' ORPorts and authorities' ORPorts and DirPorts. This change should help mitgate a set of denial-of-service attacks. Closes ticket 2667.
  • Minor bugfixes (relay, configuration):
    • Don't attempt to discover our address (IPv4 or IPv6) if no ORPort for it can be found in the configuration. Fixes bug 40254; bugfix on


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February 10, 2021


I had major problem with this on Debian Buster. My relays torrc have:
ORPort {localIP behind NAT}:443 NoAdvertise
ORPort {externalIP}:443 NoListen

After upgrade to, Tor does not even start and error says, that there is not any ORPort to listen, even if one is advertised. I did not have any problem with my relay or torrc config before, so I had to downgrade.

Someone else had similar problem:…