OAM 11gR2 external form authentication

Hi,

We're moving from Oracle Access Manager 10.1.4.3 to 11gR2.

I set up a 10g environment using form authentication hosted on apache and a colleague is now trying to implement 11g based on my old 10g setup.

We're using the DCC and are trying to use the same apache hosted login form in 11g that we used in 10g, so have set up the 11g authentication scheme as an external type.

The 11g policy does present the correct login page, but it doesn't seem to authenticate as we get the same 404 error whether we enter good credentials or bad.

Is there any obvious reason why a custom login page that worked in 10g would not work in 11g?