[horde] Horde2+Debian

[Louis Northmore]

I have just installed Horde2 and would really like webmail access to my 
dovecot imap server, however when I log in i get the following error:

 Notice: (null)(): Certificate failure for localhost: self signed 
certificate: /O=Dovecot mail 
server/OU=r2d2./CN=r2d2.louisn.homelinux.net/emailAddress=root at r2d2.louisn.homelinux.net 
(errflg=2) in Unknown on line 0

any ideas??

Thanks in advance

Louis