Teiid Designer 8.1 had some issues with the preview data, try to use 8.2 Alpha1 version.
I did updated the designer to the version 8.2 Alpha 1 but of no use, same behavious for the above 3 scenarios.
What might be the problem?
How can I make sure that 8.2 Alpha1 is used in Eclipse instead of the 8.1 version ?
we know for fact that 8.2 Alpha works with I believe 8.3 Final with no issues. I think it should work with 8.1 Teiid too, but I have not tested it.
Did you start the JBoss AS? When you entered userid/passwd did you try to test the connection there ?
Did you try connecting to the server from another external client like SquirreL to make sure your Teiid Server is up and running?
Probably Preview Data is not working 8.1.
As I could see the preview data is woking with 8.3 + 8.2 Alpha 1 combination.