SalesForce URL always invalid Teiid Designer

[johncockson]

I am unable to connect to our test/sandbox environment as any version of the test url supplied generates -  "The supplied URL text is not a valid SalesForce URL". I've tried quite a few variations and don't know what is causing this to fail. Would be nice to access sandbox so I can develop prior to full deployment. Attempted with TD 10 and 11. Any advice welcome!

[johncockson]

Had to append /services/Soap/u/32.0 to the end of URL