Problems with CA certificates in emacs 25

[Steinar Bang <sb@dod.no>]

Platform: Windows 7,
          GNU Emacs 25.1.1 (x86_64-w64-mingw32) of 2016-11-15

I tried firing up emacs 25 for the first time today.

I ran into problems connecting to my imap server.  It sort of just gave
up during the opening phase and set that server to offline.

Here's the nnimap server config:
      '((nnimap "privat"
		(nnimap-address "imap.mydomain.no")
                (nnimap-authenticator cram-md5)
                (nnimap-server-port 993)
                (nnimap-stream ssl))

Here are the contents of the " *nnimap imap.bang.priv.no 993  *nntpd**" buffer:
 * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE AUTH=PLAIN AUTH=CRAM-MD5] Dovecot ready.
 * BYE Disconnected for inactivity.
 closed
  done
 depth=0 CN = imap.bang.priv.no
 verify error:num=20:unable to get local issuer certificate
 verify return:1
 depth=0 CN = imap.bang.priv.no
 verify error:num=21:unable to verify the first certificate
 verify return:1

Process *nnimap* finished

I have signed the certificate of my IMAP server using cacert.org.  

Do I need to put the cacert.org CA file in some file somewhere? 
If so, which one?

Thanks!


- Steinar