It has been observed on some systems[1] that ssh-issue may print out: Try contacting this VM's SSH server via 'ssh vsock%4294967295' from host. i.e. it suggests connecting with VMADDR_CID_ANY, which is not valid. It seems that IOCTL_VM_SOCKETS_GET_LOCAL_CID may return VMADDR_CID_ANY in some cases, e.g. when vsock is not full initialized or so. Treat VMADDR_CID_ANY as special in vsock_get_local_cid(), the same as VMADDR_CID_LOCAL and VMADDR_CID_HOST, and return an error. [1] https://launchpad.net/bugs/2145027
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