Hi,

    For all my fellow BAN pool miners that are using Antminer S2s, I thought I'd give you a heads up on a couple of things we were talking about in the IRC chat over this past weekend.

    The default firmware file leaves an open security hole for folks to exploit, and hijack your miner to work for them. So far, this has happened to me, with a miner using the name "benutzer" (German for "user"... apropos, right?) at BTC Guild. I don't blame BTC Guild for this one bad apple, but I did try to appeal to them to drop this guy. I don't think I made any progress on that part. I'm sure that they might be good people, with one bad apple.

    Well, what I found was a firmware file that was not from Bitmain, but specific for the S2, initramfs.bin.SD-Kano-20140611145346.tar... Avoid it!!! I tried it, and I had 66 million invalid shares in just a moment. What a mess!!!  

    If your miners are not behind a firewall, for now, all I can advise is that for you to make sure /etc/cgminer.conf.factory has api-allow set as something like this:

        "api-allow": "W:127.0.0.1,R:0/0",

    It allows you to modify the configurations locally, or via the web interface.