Connecting to ISP

I cannot set TCP/IP to connect to my ISP. I hear the modem dial but then I
get the message: “… Link established… Remote message: Invalid login…
PAP authentication failed.” Yet I regularly connect to my ISP under
Windows98 and I am using the same setting. I am not connected to any local
network and my ISP provides automatic IP. The “help” in QNX is not much
helpful. Please help.