GNS3 is broken! What do I do? Troubleshooting GNS3 installation issues Windows 10 (Part 3)

More GNS3 troubleshooting tips here: https://goo.gl/S2fsc8

On MacOSX
THE DMG IS DAMAGED

You need to allow unstrusted applications in your OSX settings.

“GNS3” CAN’T BE OPENED BECAUSE IT IS FROM AN UNIDENTIFIED DEVELOPER.

You need to allow unstrusted applications in your OSX settings.

On Microsoft Windows
UPDATE FOR UNIVERSAL C RUNTIME IN WINDOWS KB2999226

If GNS3 ask you for Update for Universal C Runtime in Windows KB2999226 you need to install it. In theory this is distributed via Windows Update but you can force manual installation:

https://support.microsoft.com/en-us/help/2999226/update-for-universal-c-runtime-in-windows

On Window 7 you need service pack 1.

If you can’t install it you need to investigate why Windows Update is no longer working on your system it could be a virus blocking all updates including security updates.

API-MS-WIN-CRT-RUNTIME-L1-1-0.DLL IS MISSING

Make sure all the Windows update are installed and your computer as reboot. On Window 7 you need service pack 1.

If not working download:

https://download.microsoft.com/download/8/5/e/85edb843-93af-4daa-ad1e-c33dfa95b2ea/vc_redist.x64.exe

Install and reboot

GNS3 STOP WORKING WHEN I OPEN A FILE

If you have Dell Backup and Recovery or Alien Respawn for Alienware, you need to uninstall or upgrade it to version greater than 1.9.2.8. This software conflict with other application using Qt.

https://www.dell.com/community/Productivity-Software/Backup-and-Recovery-causing-applications-using-Qt5-DLLs-to-crash/m-p/4590325

On linux

ICON ARE TINY

Solution from fedora wiki:

https://fedoraproject.org/wiki/Common_F25_bugs#Application_issues

Start gns3 in a terminal like this:

QT_SCALE_FACTOR=1 gns3

DYNAMIPS

If you have any issue with Dynamips make sure you are using one of the recommended images listed here

My IOS configuration is not saving
Like a real hardware you need to save the configuration before the device is powered off. You can do that with write memory command.
R1# write memory

My router crash

This could be due to not enough memory.

Dynamips take 100% of my CPU

This could be an invalid IDLE PC value. Edit your router and fix it.

VMWARE

“VMware vmrun tool could not be found” when using VMware workstation player

The free version of VMware doesn’t provide vmrun the command line utility for controlling VMware your need to download it for free from https://www.vmware.com/support/developer/vix-api/

vmrun exit with Unknown error

This error mean VMware has failed due to an internal error. But the VMware tools don’t provide informations when something is wrong on his side.

This could be :

The VM is corrupted
Your VMware installation as expired
VMware ask you something in the GUI
Permissions issue with your VMware installation
It’s very important to run GNS3 and VMware under the same user.

How to troubleshoot:

Start the faulty VM in the GUI
If VM is not working reimport it
If the VM doesn’t work try to import a different VM
If this VM doesn’t work reinstall GNS3

vmrun timeout

This issue is often related to a problem with your antivirus / firewall.

See the official answer from VMware:

https://kb.vmware.com/s/article/2050353

I can’t find VMWare virtual machines in GNS3

The player version of VMware have limitation and if your VM are not in the default directory sometimes GNS3 could not found the VM.

This problem doesn’t occur with the paid version of VMware because a central database is available to third parties applications.

VIRTUALBOX

Invalid VBoxManage executable name VirtualBox.exe

In the GNS3 settings the path for your VBoxManage is incorrect. VirtualBox.exe is the VirtualBox executable, VBoxManage is the application from VirtualBox for controlling VirtualBox it’s two different executables.

Cannot start VM because hardware virtualization (VT-x/AMD-V) is already used by another software like VMware or KVM

Another virtualization software (VMware, Qemu with KVM, Hyper-V…) is already running on your computer and use your CPU hardware virtualization. Only one program can benefits of the hardware acceleration. You need to stop the other program if you want to start VirtualBox.

The following physical network interfaces were not found: vboxnet0

The default VirtualBox interface network interface are not installed on your system. You can fix that in VirtualBox preference or by reinstalling VirtualBox.

QEMU

ASA

Make sure to read the documentation:

https://gns3.com/support/docs/asa-2

And follow the recommendation.

I have trouble with my ASA 8

Asa 8 is not supported use ASAv instead:

https://gns3.com/support/docs/asa-2


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