I own and have use a USR Courier v.everything for a number years on my Amiga. As already mentioned it would apear that you connect fine.
Also, as mentioned before, try droppin the serial port down lower, try 36400pbs. This should rule out data loss due to a slow serial port having issues with a fast connection.
You also need to find out what kind of authentication protocol/process your ISP uses. Most ISPs use PAP but some cold use CHAP. Neither are compatible with each other. You also have some ISPs which still support a terminal log in, this is where your log in script would come from.
Also try dialing into the ISP with a plain old comms programme (go the BBS daze

). If you just get a load of garbage characters on the screen, it means the ISP dos _not_ support a terminal log in and you wil need to use PAP (or maybe CHAP) for your login.