Hi Jan,
If you want to pass the SSL through, then you can configure a standard TCP virtual server without an HTTP profile. Typically, the virtual server and the pool member(s) should be configured on port 443.
If you want to decrypt the SSL, you need to import the cert and key, create a custom client SSL profile and add it to a standard TCP virtual server. Typically, the virtual server should be configured on port 443 and the pool member(s) should be configured on port 80.
If you try one of these options and it doesn't work, try posting your virtual server and profile configuration using 'b virtual VIRTUAL_NAME list' and 'b profile clientssl CLIENTSSL_PROFILE_NAME list'.
Aaron