Hello, I have always this error. I am under Windows 7 Enterprise. I launch program with : x2goclient.exe --portable --add-to-known-hosts Debug log is : x2go-INFO-1> "Starting x2goclient..." x2go-INFO-4> "Translator: :/x2goclient_fr_fr installed." x2go-INFO-5> "Translator: :/qt_fr_FR installed." x2go-INFO-2> "Starting x2goclient in portable mode... data directory is: ""N:/Client/x2goclient" x2go-INFO-3> "Started x2goclient." Generating public/private dsa key pair. Your identification has been saved in /cygdrive/N/Client/X2GOCL~1/X2GO~1/etc/ssh_host_dsa_key. Your public key has been saved in /cygdrive/N/Client/X2GOCL~1/X2GO~1/etc/ssh_host_dsa_key.pub. The key fingerprint is: 32:9a:d7:5e:b5:11:1f:8d:d4:04:00:ae:76:85:dd:f6 x2goclient DSA host key The key's randomart image is: +--[ DSA 1024]----+ | ....o+.| | . o o o.| | o + = .| | . . + o | | o S . o . E| | o = . . o | | o . . . . | | . . . | | . | +-----------------+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: UNPROTECTED PRIVATE KEY FILE! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ Permissions 0644 for '/cygdrive/N/Client/x2goclient/.x2go/etc/ssh_host_dsa_key' are too open. It is required that your private key files are NOT accessible by others. This private key will be ignored. bad permissions: ignore key: /cygdrive/N/Client/x2goclient/.x2go/etc/ssh_host_dsa_key Could not load host key: /cygdrive/N/Client/x2goclient/.x2go/etc/ssh_host_dsa_key Disabling protocol version 2. Could not load host key sshd: no hostkeys available -- exiting. x2go-INFO-8> "Starting connection to server: xxx.xxx.xxx.xxx:22" Object::connect: No such slot ONMainWindow::slotSndTunOk(int) cygwin warning: MS-DOS style path detected: N:/Client/X2GOCL~1/X2GO~1/ssh/gen/key.Uhg644 Preferred POSIX equivalent is: /X2GOCL~1/X2GO~1/ssh/gen/key.Uhg644 CYGWIN environment variable option "nodosfilewarning" turns off this warning. Consult the user's guide for more details about POSIX paths: http://cygwin.com/cygwin-ug-net/using.html#using-pathnames