This article describes the issue when you receive the following error prompt:
Unable to connect to information service
Networkatlas.log file in EOC diags show error:
ERROR SolarWinds.InformationService.Contract2.InfoServiceProxy - Error executing invoke: Verb EOC.MapStudioFiles.InsertFile: Cannot find assembly
All Network Atlas on an EOC server
This is most likely caused by a file permission issue with information service and/or Network Atlas on the server.
Repair Network Atlas in the Control Panel/Programs and Features. Rright-click and click Change, and then repair. This is doesn't do anything, uninstall it there and reinstall it via c:\program data\solarwinds\eoc\EXEs folder - look for solarwinds-orion-networkatlas.exe.