WebSphere and access log

[ilacosta]

Hello, we need to solve two problems related with access logs:
We have an IBM Apache HTTP Server behind a firewall which is doing NAT. The application runs on WebSphere 5.0.2, it's secured by SSL and every page is protected.
1.- The access log only records the translated IP, so every connection seems from the same client.
2.- The access log does not records the username, because is the Application Server who checks logins.

I think the issue with the remote IP can be solved by changes in network configuration, but we don't know how log users activity.

Any hint ?

Thanks in advance.

I. Lacosta.