id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 19502,VM cannot start if network adapter has a trailing space(s) in FriendlyName,Dyno_bel,,"For some reasons my VM's with all kind of guest OS (Ubuntu, Windows, FreeBSD) suddenly refused to start with error ""Cannot start a VM because Network adapter <...> not found. You can shutdown or ..."". Name of adapter in dropdown list matched those in Windows network adapter properties.[[BR]] After digging in debug logs I mentioned this -[[BR]] @log Vbox.log.2:[[BR]] ============================[[BR]] 00:00:16.458034 AssertLogRel F:\tinderbox\win-rel\src\VBox\Main\src-client\ConsoleImpl2.cpp(5274) int cdecl Console::i_configNetwork(const char *,unsigned int,unsigned int,struct INetworkAdapter *,struct CFGMNODE *,struct CFGMNODE *,struct CFGMNODE *,bool,bool): [[BR]] 00:00:16.458076 NetworkAttachmentType_Bridged: FindByName failed, rc=E_INVALIDARG (0x80070057)VMSetError: F:\tinderbox\win-rel\src\VBox\Main\src-client\ConsoleImpl2.cpp(5275) int cdecl Console::i_configNetwork(const char *,unsigned int,unsigned int,struct INetworkAdapter *,struct CFGMNODE *,struct CFGMNODE *,struct CFGMNODE *,bool,bool); rc=VERR_INTERNAL_ERROR[[BR]] 00:00:16.458174 VMSetError: Nonexistent host networking interface, name ''''NVIDIA nForce 10/100 Mbps Ethernet''''[[BR]] 00:00:16.459027 Constructor failed with rc=VERR_INTERNAL_ERROR pfnCFGMConstructor=000007fef02e0b00[[BR]] 00:00:16.459846 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={872da645-4a9b-1727-bee2-5585105b9eed} aComponent={ConsoleWrap} aText={Nonexistent host networking interface, name 'NVIDIA nForce 10/100 Mbps Ethernet' (VERR_INTERNAL_ERROR)}, preserve=false aResultDetail=-225[[BR]] 00:00:16.460104 Console: Machine state changed to 'PoweredOff'[[BR]] =============================[[BR]] @Vbox.log[[BR]] 00:00:03.619271 [/Devices/e1000/1/LUN#0/Config/] (level 5)[[BR]] 00:00:03.619273 IfPolicyPromisc = ""deny"" (cb=5)[[BR]] 00:00:03.619274 IgnoreConnectFailure = 0x0000000000000000 (0)[[BR]] 00:00:03.619275 Network = '''""HostInterfaceNetworking-NVIDIA nForce 10/100 Mbps Ethernet ""''' (cb=60)[[BR]] 00:00:03.619276 Trunk = ""\DEVICE\{77FEAE02-6B93-4633-B53D-9B670059780A}"" (cb=47)[[BR]] 00:00:03.619277 TrunkType = 0x0000000000000003 (3)[[BR]] =============================[[BR]] Registry key at[[BR]] ""\\\Registry\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\PCI\VEN_10DE&DEV_03EF&SUBSYS_03EF1849&REV_A2\3&267a616a&0&38\FriendlyName"" was '''""NVIDIA nForce 10/100 Mbps Ethernet ""'''[[BR]] =============================[[BR]] So I suggest that somewhere in VBox's code trailing (and maybe leading) spaces in the adapter's name are trimmed, causing further mismatch.[[BR]] After I changed registry key (deleted trailing space character) all my VM's started perfectly, as before. ",defect,new,network/hostif,VirtualBox 6.1.6,,,,all,Windows