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/kb/2999226 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: http://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. http://en.community.dell.com/support-forums/software-os/f/3526/t/19634253 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 c