I recieve the below error often on many of my Exchange 2003 servers. I do not have access to the DCs, however, what exactly is the error refering to? Besides that the DC needs to be rebooted, I think.
Event ID 9176....Source MSExchangeSA...Type Error
NSPI Proxy can contact Global Catalog <DC name and domain> but it does not support the NSPI service. After a Domain Controller is promoted to a Global Catalog, the Global Catalog must be rebooted to support MAPI Clients. Reboot <DC name and domain> as soon as possible