id summary reporter owner description type status component version resolution keywords cc guest host 7457 Passwordless Guest control execute fails Technologov "Host: Windows XP 32-bit, Intel Core 2 Q6600, VBox 3.2.8 Guest(s): Windows 7/Vista 32/64bit, RHEL 5 x64. According to VBox docs, section ""8.28. VBoxManage guestcontrol"", if I omit --password parameter, it is empty. However in practice this doesn't work. I have also tried: --password """" In both cases command fails, until I set user's password in my Windows guest, and use it in VBoxManage. In RHEL 5 Linux guest, I have deleted the user password in /etc/passwd by modifying the second column: :x: --> :: VBoxManage returns: VERR_LOGON_FAILURE (Windows guest) Invalid user/password credentials (Linux guest) There is no difference whenever I use ( --password """" ) or simply skip this parameter. If this is expected behavior, then it is worth adding a note in VBox manual. -Technologov, 10.9.2010." defect closed VM control VirtualBox 3.2.8 invalid other other