Problem establishing Business Connector 4.8 and R/3 connection

Hello,
I'm currently running a few SAP Business Connectors 4.7 servers for my company, all connected to SAP R/3 4.7 backend, and everything works fine.
I tried to setup the new BC 4.8, on a fresh Windows 2003 server, the install went fine, but when I try to make a new R/3 connection, with a working and existing RFC user (previously used by the former BC 4.7), I have the following error message :
Error : class com.sap.conn.jco.JCoRuntimeException
Message : Name or password is incorrect. Please re-enter on 192.168.0.4 sysnr 00
Service : sap.admin.server:getInfo
I don't understand because if I unplug the 4.8 server and plug back the 4.7 one with exactly SAME user/password and same R/3 connection properties, it works fine...
I precise I re-typed manually the login/passwords in both BCs to ensure it's not due to a typo error.
I have read that JCO has changed between 4.7 and 4.8 releases. Could it have an impact ? Also do I still need to install a librfc32.dll in my windows/system32 directory ?
Any clues ?
Thanks in advance for your help
P.
Edited by: Patrick TOURNEUR on Jul 21, 2008 6:40 PM

Hello,
just for your info, the JCo implementation has changed about this login function. BC 4.8 is using JCo 3, 4.7 used JCo 2.
I never understood the whole problem completely, but as you found out by yourself, you are safe if you enter the user/pwd in SAP only uppercase, and also in BC
SAP changed this user/login up/lowcase stuff at some time, which has caused many trouble in projects.
CSY

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