What is the difference between DIGI Connect SP and DIGI Connect ME?

Which is the difference between DIGI Connect SP and DIGI Connect ME.
I have a DIGI Connect SP with problems and I am substituting for a DIGI Connect ME that no this getting communication for Real Port
My operating system is Windos server 2003

Here are links to the data sheets for the two products:

Connect SP: http://www.digi.com/products/serialservers/digiconnectsp.jsp

Connect ME: http://www.digi.com/products/embeddedsolutions/digiconnectme.jsp

As for not getting communication from the Windows 2003 server running Realport, have you tried pinging the IP address of either device?

If you can ping it, the driver will hopefully be able to connect to it as well, provided the device is setup correctly (use serial port profile “realport”) for use with the driver and nothing is blocking TCP port 771, which is the port that the driver communicates over.

Without details about the configuration of your hardware its hard to say though.