Since you've had no replies so far I'll just tell you what I know. The interface you're using is the right one, and you appear to be using it correctly to access data about the linked server.

However, access to linked servers is only ever as good as the ODBC driver used, and they are nearly always a little quirky. Getting them to work is a little tricky, and when you do you just leave them alone.

If you just need to know the structure of I table I'd recommend just drilling down using Object Explorer in SQL Server Management Studio (see the attached image). If you can't do this then you'll need to talk to a DBA - you probably don't have the appropriate permissions.