不得其門而入

Etymology
From the Analects, Book 19 (《論語·子張》):



Idiom

 * 1) to not have an "in"; to be unable to crack into (a market); to try to find an in without any success; to be unable to gain entrance
 * 2) * 2005: Design News China editorial staff, 争议英特尔称AMD旧技术援华 (Dispute ... Intel claims that old AMD technology is helping China)
 * "zh"

- 在經歷了多年的不得其門而入後，中國終於在2005年10月24日正式成為“X86體系俱樂部”的正式成員.


 * 1) * undated: China National Cotton editorial staff 中国企业信息化道路 (Information Super Highway for Chinese Industries)
 * 因此，若你所安裝或開放的功能、網路服務與通訊連接埠越少，駭客就越不得其門而入.
 * Because of this, the fewer capabilities/network services and communications connection ports that you install or open, the more that hackers will be unable to gain entrance (to your system).