id summary reporter owner description type status component version resolution keywords cc guest host 12426 Cannot start VM with more than 5 network adapters of type Am79C973 => Fixed in SVN andynor "On Windows7-64 and Ubuntu-64, upgrading from VirtualBox 4.2.18 to 4.3.4 caused a virtual machine to produce an error message at boot: ""failed to open a session for the virtual machine . Failed to allocate 524288 bytes of memory for the PCNet device (VERR_PGM_TOO_MANY_MMIO2_RANGES)"" Result Code: E_FAIL (0x80004005) Component: Console Interface: IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6} The problem is related to having more than 5 (6,7 or 8) network interfaces enabled and is only observed when creating a virtual machine with the ""Linux other"" 32-bit template. The ""Linux other (64-bit)"" has no issues. The difference in config files is PEA, LongMode and IOAPIC enabled in 64 vs 32 bit and the default network adapter type. (32bit: Am79C973 and 64bit: 82540EM. Setting adapter type to 82540EM after using the 32-bit template fixes the problem. * VBoxManage.exe modifyvm --nic intnet | 1 to 8 * VBoxManage.exe modifyvm --intnet | 1 to 8 with different strings * VBoxManage.exe modifyvm --nictype 82540EM | 1 to 8 Diff: http://diffchecker.com/ljbxd5lr" defect closed network/hostif VirtualBox 4.3.4 fixed Linux Windows