If {HEAD ~ a connection} from User PC 20 to {TAIL ~ Weather Server} 26 cannot be established, the path becomes red 
to
If { HEAD ~ a connection } from User PC 20 to { TAIL ~ Weather Server } 26 can not be established , the path becomes red
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH