id summary reporter owner description type status component version resolution keywords cc guest host 12858 VRDP crashing VM => Fixed in SVN Alexandre Felipe Salgado Figueiredo "Hi, I´ve being experiencing problems with VBoxSVC when more than 50 VM´s are started, it locks with 13 to 15 % of system resource utilization, and if I try to stop or save one VM, it keeps locking the files preventing to change configurations/restarting the VM. The only way to unlock the files is to stop all VM´s and reboot the Host (killing VBoxSVC after all VM´s down just messes up everything ). I use this environment to test our multiuser application , and I need an environment with 70-80 VM´s running (heterogeneous , with Windows XP, 2003 and 7 as guests ), memory is not an issue, as with all VM´s running I still have 15Gb free on the host. The host is a Core i7 4870K , with 64Gb of memory running Windows 2012R2 Enterprise. The vhd/vdi files are stored in a RAID 5 array (pretty fast ). Also starting on Virtual Box 4.3.6 higher, VRDP doesn´t work as expected, when there are multiple people connected it crashes the VM with this log ( actually this log is from version 4.3.8 ) : Faulting application name: VirtualBox.exe, version: 4.3.8.0, time stamp: 0x530cd30d Faulting module name: VBoxVRDP.DLL, version: 0.0.0.0, time stamp: 0x530cd502 Exception code: 0xc0000005 Fault offset: 0x000000000001e85a Faulting process id: 0x1044 Faulting application start time: 0x01cf41d9afc6f1b3 Faulting application path: C:\Program Files\Oracle\VirtualBox\VirtualBox.exe Faulting module path: C:\Program Files\Oracle\VirtualBox\ExtensionPacks\Oracle_VM_VirtualBox_Extension_Pack\win.amd64\VBoxVRDP.DLL Report Id: f4b24832-b059-11e3-8924-4c72b97cdd2d Questions : 1- I´ve researched a lot about number of VM´s limitation on Virtual Box and all I found is that it´s limited to the host resources ( or 128 VM´s ). 2- Is this VBoxSVC problem a configuration issue or a “bug” , i´ve not found anything about this behavior on the community 3- Is this VRDP crash problem ( and also huge slowness on 4.3.8 version) a configuration issue , limitation or bug ? 4- What more information I can supply to help figuring out these issues ? " defect closed host support VirtualBox 4.3.8 fixed VRDP Windows Windows