There are two main options:
1.
In Central Admin navigate to General Application Settings, Configure Notes Migrator for SharePoint Services (location will vary depending on SharePoint version).
Select the relevant site collection & ensure the "Enable import service" checkbox is selected.
Make sure that from the NMSP console the name of the front end server can be resolved - add an entry to the Hosts file if necessary.
On the NMSP console machine open the Hosts file (C:\WINDOWS\system32\drivers\etc) & add an entry for the network load balancer name so that this resolves to the IP address of the front end server which has the NMSP services installed (as opposed to the IP address of the load balanced virtual name). E.g.:
13.92.64.88 load_balanced_name load_balanced_name.domain.com #maps the load balanced name to IP of the front end server which hosts the import service
Clear the DNS cache on the console by issuing the command "ipconfig /flushdns" from the command line, & check using ping that the name resolves as required.