Customer has a CIFS file provider / Node in UW with a path of  c$/temp

when the data provider type is changed from CIFS to SMB and the Ping button is used to perform a test connection the following error is displayed.

File Server Connection Test was not successful

Error: STATUS_BAD_NETWORK_NAME(3221225676/3221225676): Could not connect to \\server.company.com\c$/temp

The fix is to change the path from  c$/temp to c$\temp.