CONNECTION_CLOSE can be sent in 0RTT packets
@@ -6751,6 +6751,8 @@ static ngtcp2_ssize conn_recv_pkt(ngtcp2_conn *conn, const ngtcp2_path *path,
case NGTCP2_FRAME_RETIRE_CONNECTION_ID:
case NGTCP2_FRAME_PATH_CHALLENGE:
case NGTCP2_FRAME_PATH_RESPONSE:
+ case NGTCP2_FRAME_CONNECTION_CLOSE:
+ case NGTCP2_FRAME_CONNECTION_CLOSE_APP:
break;
default:
return NGTCP2_ERR_PROTO;
