I strongly deny that kr.4miners.net had any connection with the 51% attack on Krypton network.
I double checked the logs and there is no trace of any security breaches on main and backup pool servers. Gkr instances was manually compiled from latest code (https://bitbucket.org/gkrypto/go-krypton). Code was not modified in any way and nodes run without interruption. Hashrate jumps over 51% alot of times since pool start (alternating with suprnova), and it's pretty common with low network hashrate coins. Of course, this is not desirable, but we make every effort to keep our servers secure for such cases.