First, I would try to determine where exactly the Excel data source is located on Server B, and furthermore, how it is being shared to Server A (via HTTP or FTP).
I was able to connect to an Excel data source by following [this documentation](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/creating_data_sources_and_base_views/excel_sources/excel_sources).
I suggest making sure that [the path is correct for HTTP clients](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/creating_data_sources_and_base_views/path_types_in_virtual_dataport/http_path#http-path), and that both [the path and credentials are correct for FTP servers](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/creating_data_sources_and_base_views/path_types_in_virtual_dataport/ftp_sftp_ftps_path).
If you’re only interested in reading data from the Excel file, you do not need a specific driver, and an HTTP or FTP connection is fine.
Hope this helps!