Java Security

hi,
I'm trying to set up a servlet to servlet communication line using SSL. With the same code, I have servlet to servlet communication with out SSL and client to servlet communication with SSL. However, when I try to set it up SSL servlet to servlet I get an 'untrusted server cert chain' exception thrown.

Does anyone know how to solve this? I don't think it is to do with the location or contents of my keystore as it works fine with a client connection to both servlets.

Any ideas?

Cheers

Ben