2668 is packet PROTOCOL_BASE_GET_ITEMS_FOR_RANK_UP_REQ and waits server opcode 0xA6D.
2567 (PROTOCOL_BASE_GET_FRIENDS_REQ) waits server opcode 0x112.
2577 (PROTOCOL_BASE_USER_LEAVE_REQ) waits server opcode 0xA12.
Try to send this packet (I didn`t look into it):
SendPacket(new byte[] { 0x0c, 0x00, 0x21, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 });Code: C#
Before PROTOCOL_BASE_LOGIN_ACK (opcode 0xA04).