Deafult server credential

I have recently constructed a Win2k AD at my office, all seems to be running well except I keep getting a warning in my event log as follows

No suitable default server credential exists on this system. This will prevent server applications that expect to make use of the system default credentials from accepting SSL connections. An example of such an application is the directory server. Applications that manage their own credentials, such as the internet information server, are not affected by this.

Which leads to the following warning

LDAP over SSL will be unavailable at this time because the server was unable to obtain a certificate.

Is this something to be worried about or is this normal.

Any help here is greatly appreciated