Unable to run UFT test from ALM

ALM Version: 11.52.580 Patch Level 5

UFT Version: 12.02

When I run a UFT test from ALM, the Automatic Runner window opens and the status is "Connecting..."; but there after nothing happens. It's just stuck there endlessly. I have absolutely no idea where to even start looking. Please let me know if any of you have faced this issue before and know how to resolve.