100% reproducible. With the latest libssh f20 update, x2go uses 100% cpu (on 2 cpus) Update to libssh.x86_64 0:0.6.0-1.fc20 I get an error message (as I showed) on connect, and 100% cpu Downgrade to libssh-0.5.5-1.fc20.x86_64 Problem gone