There is a problem connecting to a resource on the far side of a bridge.
Lack of connectivity means that traffic cannot pass from site to site. You can lose connectivity after a long period of successful operation, or at any time after the units are physically deployed. In either situation, the troubleshooting procedure is the same. To isolate the point at which connectivity is lost, use the ping utility from a command line in your computer's operating system to:
Ping computers on (the PC or other host on the local wired LAN)