How do you ban a miner?
What's the process for banning a miner, assuming you have their IP address?  Would be useful to be able to ban by user agent if that's possible.

Have an issue where a miner is using a proxy (useragent = stratum-proxy/1.5.7) and submitting a large amount of low diff shares and disconnects before the retarget.  Seems to be a way to build up shares in a PPLNS payout disproportional to the amount of work put in.