Dell IDRAC6 User Manual page 127

When accessing the iDRAC6 Web-based interface, I get a security warning
stating the SSL certificate was issued by a certificate authority (CA) that is
not trusted.
iDRAC6 includes a default iDRAC6 server certificate to ensure network
security for the Web-based interface and remote RACADM features.
This certificate was not issued by a trusted CA. To address this security
concern, upload a iDRAC6 server certificate issued by a trusted CA
(for example, Microsoft Certificate Authority, Thawte or Verisign).
See "Securing iDRAC6 Communications Using SSL and Digital Certificates"
on page 349 for more information about issuing certificates.
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Advanced iDRAC6 Configuration