OWA 2010 - user cannot logon

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I have 1 user on a child domain that cannot login to OWA on our Exchange 2010 server.

The exception through is as follows:

Exception
Exception type: Microsoft.Exchange.Data.Storage.StoragePermanentException
Exception
message: There was a problem accessing Active
Directory. Check your network connections and try again.

I have researched this issue and found that it can usually be fixed by making sure the "Allow inheritable permissions from the parent ..." option in advanced security is checked.  That option is already checked so I am not sure where to go from there.