网络都不通，当然会出现问题了。没事不要拔网线玩。Cause: Invalid TNS address supplied or destination is not listening. This error can also occur because of underlying network transport problems.Action: Verify that the service name you entered on the command line was correct. Ensure that the listener is running at the remote node and that the ADDRESS parameters specified in TNSNAMES.ORA are correct. Finally, check that all Interchanges needed to make the connection are up and running.
如果是本机，NT是没有问题的，但2000就不同了，如果你拔下网线，用ipconfig都找不到ip，你的IP地址没有了，也连不上了。