I have a fully functioning Internet Sales 4.0 app connected to an R/3 4.6C backend. The setup is working perfectly and has for several months. Our company is upgrading from R/3 4.6C to ECC 6.0.
We have a test SBX, running ECC 6.0, setup for testing. I am having major issues getting my Internet Sales 4.0 application to work. The first issue has to do with logging in (I should note that the SBX is a copy of our 4.6C PRD server).
All I have simply done so far is change, in the XCM config (b2b, trexr3, shop), the Jco host, from the 4.6C server to the new ECC 6.0 SBX. When I attempt to login, via the ISA login page, my password is not validated and I get a "user administration" error.
I have verified that the account in question is valid, not locked, and I am using the correct password.
What is really irritating is that when I put a trace on the login process, the log really doesn't show me anything of value (a Java trace, for lack of a better description). There is no "error" or "exception" in the log.
To further test, I removed all customizations made to the ISA and deployed a standard ISA B2B.ear file (SP9, I believe), but no luck.
I can repoint the Jco to any other of my 4.6C servers and the ISA site (login) works perfect. No other adjustments need to be made.
I guess my questions is, is there anything additional I need to do in order to connect ISA R/3 edition to an ECC 6.0 backend besides just changing the JCo connector?? I've search quite a bit at the Marketplace, looked for SAP Notes, Googled for hours...no luck.
Forgot to mention that when I run the "JCo Ping" tests from the various XCM web pages, the results are "green", so I can definately "see" the new ECC 6.0 server.
One last thing, assume my account name and password are both "bryan"...well, if I put "bryan" in the username field and "john" in the password field, and click the "Change Password" button, I am told that my password is incorrrect (interesting)...so, I'm thinking there must be communication going on. If I put the correct password and correct username, then click the "Change Password" button, I get the "user administration" error.
Thanks for any feedback!!

