I'm getting this error on a domain controller at very regular intervals... Referral Interface cannot contact any Global Catalog that supports the NSPI Service. Clients making RFR requests will fail to connect until a Global Catalog becomes available again. After a Domain Controller is promoted to a Global Catalog, it must be rebooted to support MAPI Clients. EID 9143... I think it could be to do with the binding order of the 2 NICS???? Could it be and if so how do I change the binding order of them and what to?