7  Remote  virtual  machines  Note:  In  rare  cases,  if  the  CPUs  of  the  source  and  the  target  are  very  different,  tele-  porting  can  fail  with  an  error  message,  or  the  target  may  hang.  This  may  happen  especially  if  the  VM  is  running  application  software  that  is  highly  optimized  to  run  on  a  particular  CPU  without  correctly  checking  that  certain  CPU  features  are  actually  present.  VirtualBox  filters  what  CPU  capabilities  are  presented  to  the  guest  operating  system.  Advanced  users  can  attempt  to  restrict  these  virtual  CPU  capabilities  with  the  VBoxManage  --modifyvm  --cpuid  command  see  chapter  8.7.5,  Teleporting  settings,  page  114.  98  
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