Error code: 500... Certificate chain not trusted?

I'm getting this error message:

Error Code: 500 Internal Server Error. The certificate chain was issued by
an authority that is not trusted. (-2146893019)

When trying to access my exchange 2003 OWA from my ISA server2004 machine.

This only happens when accessing it through https://FQDN/exchange rather
than https://officeserver/exhange

How can I make the authority trusted?



.

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