User blog comment:Nanamin/Bypassing the DMM Error Area/@comment-26486243-20151027162759

I should probably add that ever since one of the recent patches, you must now sign up for a KanColle account using a Japanese IP (such as through a VPN) first, and select your world with the timezone set to JP. Failing to have a JP IP at the registration stage = 100% IP block regardless of your cookie settings. If your timezone is not JP, then at the server selection you WILL catbomb.

After making your account and selecting your world (such that now, the world name appears in the bottom right below the Play Now blue button), you can now disengage the VPN, and use the cookie method permanently from here on out.