![]() Scroll down to the Rules section and click on Add rule. Then it would open up the firewall management section. ![]() Net/Error when connecting to the GNS3 server:Connection Refused on vmware: SOLVED. Open McAfee Endpoint Security and click on the firewall section. Sometimes it helps, but most of the time it fails. Although, the KVM deployment is the same on other GNS3 versions too. Then I would restart the nodes, lab and VM. I can do ssh and can also access WebGUI, but when I access via SmartConsole, I get operation timed out message most of the time. What I found to be the actual problem is that I am running a version of Windows that also supports Hyper-V, and it turns out that if Hyper-V is turned on, nested virtualization won't work in VMWare. I have the conectivity between Windows PC and SMS. This may not be a requirement for you, but it is for me, and so I don't really consider this a solution. 5- Check the file extension, If possbile copy the exact file extension from TFTP server file and paste on the router. 4- Make sure your TFTP server is turned on. However, be advise that KVM support (nested virtualization) will be disabled, and so you will not be able to run things like Cisco VIRL images. pkgresources.DistributionNotFound: The aiohttp-cors0.7.0 distribution was not found and is required by gns3-server. 3- Check if there is any firewall issue or tftp application on the computer. If you go to Virtual Machine Settings > Hardware > Processors and uncheck "Virtualize Intel VT-x/EPT or AMD-V/RVI", you should be able start and use the VM. ![]() By default, the GNS3 VM is set up to support nested virtualization, and if you are seeing this error message, it is because there is something going on in your host system that is preventing nested virtualization from working.
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