Thanks for your help CK. I changed the port to 4334 and removed the worker extension. The owner of the rig is saying "diff shows 1MEG on the miner. It will never return any hash at that diff. Diff should be about 12k."
It will return hashes, it'll simply take a longer time (also means your effective pool hashrate will fluctuate a lot more).
Assuming you're mining with an Antminer S9, you'll get a share every 5-6 minutes (on average).