Neither able to connect to Primary Domain Controller nor to any of Back up Domain Controllers.

OIM to AD Provisioning Issue.

Error :

<Feb 25, 2019 3:11:37,441 AM GMT> <Error> <ORACLE.IAM.CONNECTORS.ICFCOMMON.PROV.ICPROVISIONINGMANAGER> <BEA-000000> <oracle.iam.connectors.icfcommon.prov.ICProvisioningManager : createObject : Error while creating user
org.identityconnectors.framework.common.exceptions.ConnectorException: Neither able to connect to Primary Domain Controller nor to any of Back up Domain Controllers.
        at org.identityconnectors.framework.impl.serializer.CommonObjectHandlers$13.createException(CommonObjectHandlers.java:265)
        at org.identityconnectors.framework.impl.serializer.CommonObjectHandlers$13.createException(CommonObjectHandlers.java:262)
        at org.identityconnectors.framework.impl.serializer.CommonObjectHandlers$ThrowableHandler.deserialize(CommonObjectHandlers.java:115)
        at org.identityconnectors.framework.impl.serializer.binary.BinaryObjectDecoder$InternalDecoder.readObject(BinaryObjectDecoder.java:162)
        at org.identityconnectors.framework.impl.serializer.binary.BinaryObjectDecoder.readObject(BinaryObjectDecoder.java:313)
        at org.identityconnectors.framework.impl.serializer.binary.BinaryObjectDecoder.readObjectField(BinaryObjectDecoder.java:417)
        at org.identityconnectors.framework.impl.serializer.MessageHandlers$5.deserialize(MessageHandlers.java:156)
        at org.identityconnectors.framework.impl.serializer.binary.BinaryObjectDecoder$InternalDecoder.readObject(BinaryObjectDecoder.java:162)
        at org.identityconnectors.framework.impl.serializer.binary.BinaryObjectDecoder.readObject(BinaryObjectDecoder.java:313)
        at org.identityconnectors.framework.impl.api.remote.RemoteFrameworkConnection.readObject(RemoteFrameworkConnection.java:153)
        at org.identityconnectors.framework.impl.api.remote.RemoteOperationInvocationHandler.invoke(RemoteOperationInvocationHandler.java:101)

Solution:

1. Login to sysadmin console
2. Click on IT Resource
3. Search for AD IT Resource 
4. Copy the AD Machine Name by going into Control Panel\All Control Panel Items\System and copy Computer Name
5. Update the name in  LDAPHostName 
6. Test retry failed create user event or provision of a new user.

-Arihant