api.polmine.pl (and polmine.pl) are refusing connections on 8361, 8347, 8547 since 2015-Oct-20 15:34 EST
I was able to transfer BTC balance (NMC balance was too low). But unless I missed some big API change not in their FAQ, they seem to be kaput.
Thanks. It seems to have been down for a good few days now. Before I remove them, I'll wait another week to see if they come back online -- the website is still up, so there's some hope.