Hi,

In the Host Definition screen (when creating a new or editing a host), there is a mandatory field "Agent Interface".

If there is no agent deployed on the host (for instance if this host is there only for Web Scenarios), there is no reason to have this agent interface configured.

The trick to go through is to set whatever you want in this field, otherwise you can't add/update the host definition.

Besides, setting an agent interface which points to non existing host (or host where an agent isn't installed) might cause the host icon (host list) to become "red" for no reason. What I mean is that it is technically true to have the host "red" because the agent cannot be contacted, but it should be green in principle (because you don't need an agent)