Setspn SQL fail

Hi,

I have a windows server 2008 R2 with SQL 2008 R2 installed.
When starting the default instance i get event id 26037 with description
The SQL server network Interface library could not register the service Principal Name for the SQL server service. Error 0x2098 state 15: failure to register an SPN may cause integrated authentication to fall back to NTLM instead of Kerberos. This is an informational message. Further action is only required if Kerberos authentication is required by authentication policies.

When performing a setspn -L is displays the following
MSSQLSvc/:1433
MSSQLSvc/:1433
MSSQLSvc/

So SPN should be registered.

What could be wrong?