By default, GFI EventsManager performs event collection using the security context of the account under which the GFI EventsManager service is running. Alternative credentials can be configured for each computer or group of computers in the GFI EventsManager configuration -> Event Sources.
It is recommended that you group target computers and specify alternate credentials that apply to that computer group. The credentials can be changed from the 'Logon Credentials' tab in the properties of the group. On the properties of the target machine forming part of the group, you can select the option to 'Inherit the logon credentials from the parent group' or alternate credentials for the target computer in 'logon using credentials below'.