RFC connection.

Hello All! I'm want to create RFC (R/3) connection between SAP Netweawer 2004s (Basis 7.00) and R/3 Enterprise (Basis 6.20). Connection to 2004s --- R/3enterprise are fine, but then i'm create connection R/3enterprise - 2004s i'm view the error after TEST Authorization. If i'm press remote logon i'm view the Logon screen, if i'm enter the same USER login and password --- logon are fine,,, Why immediately is not got?

Thanks and regards !!

Sergo Beradze