This server’s clock is not synchronized with the primary domain controller’

Hello,

I have a server (the server is a domain member \\server1.mydomain.com) which must be synchronized with a external source (the rest of the computer are synchronized with PDC). When the external source have more than 10 minutes of delay I cant?t access to share folders inside this sever doing \\sever1.mydomain.com (I can access using ip address) and I get the following error:
This server’s clock is not synchronized with the primary domain controller’s clock

This artcle from microsoft say:
http://www.microsoft.com/technet/pro….mspx?mfr=true

The internal clock for servers must be set to within 10 minutes of the domain controller’s clock

I want to increase this 10 minutes. Anybody know how can I do it?.

Thanks
Pablo