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Reason for asking is that when testing CanConnect() on my dev PC - the function returns false whereas it returned true prior to moving the site.
No, it shouldn't matter whether LM is installed in a parent or child portal. What does matter is that the portal has a domain alias. That's where your LM licence needs to be registered to, and it is also will determine the domain of the Url with which your modules should communicate when validating licences.
So, if your module is returning CanConnect() = false in your development environment, check:
Hope that helps.