It's obvious but check that the network service that is reported as causing a problem is indeed a valid service. Check that the system is correctly DNS registered if you suspect that this may be the cause of the problem. You can check whether the system is registered in the DNS from here . If you are using a routing daemon, additionally check the setting of the IP broadcast address. If any of these is set incorrectly you can expect problems using the network.
Ping is available for many computer platforms.
Armed with Ping you can check the connectivity of your network very quickly. With our network model in mind the best strategy when troubleshooting is to start pinging devices that are near to you and then to try to ping devices that are progressively more remote. If you fail to ping a device then you've isolated the problem. If you can ping 137.222.20.144 you know immediately that this part of the network is okay GOTO 2 . If you can't ping 137.222.20.144 GOTO 5 .