That's not about the concurrent connections, that's saying that SmartConsole has lost track of how many CXL/VS are configured on the actual VS. If it lines up (you can check with 'fw ctl multik stat' from the VS context on the gateway) then you should be safe to just click 'OK' and not have any impact to connections. Worst case, assuming this is VSLS cluster, there will be a VS failover/fail back. If you are uncomfortable with this, or if it's in a highly sensitive environment, best to do it in a maintenance window.