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