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GNS3 "Cannot connect to compute 'GNS3 VM'": how to fix it
GNS3 can't reach the server inside the GNS3 VM. Find the VM's IP, test port 3080, fix the host-only network, versions and firewall.
gns3troubleshootinggns3-vmnetworking
GNS3 "KVM support available: False": how to fix it
The GNS3 VM can't see VT-x or AMD-V. Enable nested virtualization in BIOS, Windows and your hypervisor, then check it with kvm-ok.
gns3troubleshootinggns3-vmvirtualization
GNS3 client and server version mismatch: how to fix it
GNS3 refuses to connect when the app, the GNS3 VM or a remote server run different versions. Find each version, then upgrade so all match.
gns3troubleshootinggns3-vmupgrade