My KCVDS 1.15 A is fully updated but when a challenege is accepted the only message i get after a few seconds is ; [user] is unable to connect you. please check your internet settings. plz help.
Enter your hamachi IP in the hamachi box and click OK. If that did not work, then you cannot host for some other issues. No need to get into details. Bottom line, if it does not work via Hamachi, you cannot host.
I used to have this problem till i figured out how it works [it works for me not sure for others] when you click create a duel...there's a window where you can choose to host via ham or via IP and a place where your IP is written. Erase the written IP then type your hamachi's IP then host via ham [might work via IP too]
and if all this did not help you just go to www.setokaiba.com/BattleCity > at Kaiba corp Support >read the sticky topics their and u log in their by ur kcvds account.