Depends on what kind of endpoint connectivity you are trying to confirm. If it's like a MySQL database or something like that, there's a check dialogue with 'test' button right in the configuration options of the same. Similar 'test connection' options are available for other added resources. Finally if you just add a server as a resource, as long as it lights up green on the list of servers it's able to connect to it (provided any credentials that may be needed are correct), but a green light means a standard read/write check has been done to confirm connectivity.

Documentation here:
http://www.neotys.com/documents/doc/neoload/latest/en/htm...