How to attach back the Android emulator to ADB?

As you said, the problem is not Eclipse losing contact with the Emulator, but ADB - the Android Debug Bridge - losing contact with it. As Eclipse uses ADB to communicate with the emulator when ADB is broken Eclipse can do nothing.

Sometimes a kill-server won't help at my machine (WinXP). For example I can't see the emulator in the DDMS-View any more or I do see it but no processes running on it.

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