We are using Alchemi 1.5 . When we run the executor and manager on same machine the connection is established. When the executor runs on machine X and manager on Y the connection is not established. Even when port and IP are hardcoded there is no success.
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I've noticed similar behavior if the machines are not accessible via Windows Networking.
If you can ping from one machine to the other using the computer name then the Executor can connect and will be used, however if you can only ping via IP, then the Executor _might_ connect, but isn't actually used for execution.
(My analysis might be off, but that's what I observed between the two of my machines.)
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The manager connects to the excutors based on the machine name that the executors report when they connect. If the machine name of the executor cannot be resolved on the manager pc no threads are sent for execution. In this situation i test out the problem by adding an entry to the managers hosts file so that the manager can then ping the executor by name. This usually allows the executor to work.