If a desktop app user creates a service with the name test (and port 2000), then tries to create a service with the name test and another port then the operation fails:

The reason is that ultimately we try to start a worker for the TCP outlet at an address which is already taken by the first TCP outlet.
Unfortunately the reason for the failure is not clear for the user.

This should be prevented by:

1. checking that the address is not already taken and return an appropriate error message
2. print the cause in addition to Failed to create outlet (additionally we should say 'service' here to keep the vocabulary aligned).

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