The app is a Delphi client interface connects to a SQL Server and we have another server storing some pdf files for the application. Users in the UK sites just need to install BDE using server's IP address on the servername field and install the client program and as long as they have rights to access the servers, it works. However, for US users, their pcs cannot ping to the servers so I guess they won't be able to connect to the database server and the pdf files server. Our security guy asked me which port I need to open for this and I don't know.
It is not a DataSnap application and I would say we are trying to connect across the internet or WAN (if this makes sense). Not sure about transport.