This Counter64 totals the remotely-initiated Phase-1 control tunnels that failed to activate, per its description - the failure-rate companion to cisgIpsSgGlobalRespTunnels, reflecting how often this device fails to successfully respond to an incoming connection attempt. A rising rate here on a hub device suggests either local capacity issues, a policy that doesn't match what spokes are proposing, or resource exhaustion under connection load. An admin seeing this climb specifically during business-hours peak connection times would suspect the hub is hitting a capacity or CPU limit when handling a surge of incoming spoke connections.