Ok, the reason why it works with ca-bundle.crt removed is that boinc/curl uses /etc/ssl/certs/ca-certificates.crt then by default.
You can test whether you have the required cert installed using the following command (in a shell): curl -s -I https://secure.worldcommunitygrid.org/ > /dev/null ; echo $? It should say "0". The required certs appear to be: mozilla/Entrust.net_Secure_Server_CA.crt mozilla/Entrust_Root_Certification_Authority.crt Please check with "sudo dpkg-reconfigure ca-certificates" if you have those enabled. Also, make sure that you have no stale /var/lib/boinc-client/ca-bundle.crt file lying around (it should be a symlink - or you could remove it). You could check this using: curl -s --capath /var/lib/boinc-client/ --cacert ca-bundle.crt -I https://secure.worldcommunitygrid.org/ > /dev/null ; echo $? Please provide feedback here, if you are experiencing the problem currently, and include your distribution, if you had/have the certs installed (now) and how the "curl" commands mentioned above fail. -- Wordcommunitygrid Message "Peer certificate cannot be authenticated with known CA certificates." https://bugs.launchpad.net/bugs/246205 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs