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