Does this bit from the docs apply to your situation?
<blockquote>
To use HTTPS with the cfhttp tag, you might need to manually
import the
certificate for each web server into the keystore for the JRE
that
ColdFusion uses. This procedure should not be necessary if
the certificate
is signed (issued) by an authority that the JSSE (Java Secure
Sockets
Extension) recognizes (for example, Verisign); that is, if
the signing
authority is in the cacerts already. However, you might need
to use the
procedure if you are issuing SSL (secure sockets layer)
certificates
yourself.
</blockquote>
http://livedocs.adobe.com/coldfusion/7/htmldocs/00000272.htm
--
Adam