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Secondary controller can't access primary controller

My company is running two servers in a badly configured domain (I inherited it). Recently, the secondary controller lost access to the primary controller. They can ping each other but when I try to connect to a shared drive on the primary from the secondary I get the following error message. "F: is not available. The target account name is incorrect." Any suggestions?
When something inexplicable like this happens, the first place I look is DNS name resolution and Active Directory replication. Use the dcdiag and netdiag tools (available from the Support Tools folder on the installation CD) to determine if your two domain controllers are replicating correctly. If not, you can use the output from these tools to determine the point of failure. You should also check the Application, System and Directory Services log in the Event Viewer of each domain controller to look for more information.

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