The web front ends (WFEs) of a SharePoint Farm are part of an NLB cluster.
How should the Notes Migrator for SharePoint Web Services be installed?
The Document link in the Doc link does not work properly and gets error Unknown Error when trying to click on a doc link in SharePoint which has been migrated from Notes to SharePoint.
Install the Notes Migrator for SharePoint Web Services on every WFE in the farm.
The URL for the Import Service needs to be a load balanced URL or all the Web Front ends in the SharePoint farm need to be aware of the NMSP web services for the links to redirect to the NMSP Import Service website.
Just installing on all the Web Front Ends would resolve the document linking and the designer client to communicate to the NMSP web services.