Hey!
We just started to use a Big-IP 9.x 6400 and are trying to get 4 People Soft web servers setup behind it. They are running WebLogic.
At first just configured it with a static test ...
Do you have the BIG-IP inserting an HTTP header WL-Proxy-SSL=true or WLProxySSL as seen here (Click here) so that weblogic server knows that there is SSL being done on the front end?