Altai SSA, Wid Badee Abdulaziz, alsaadi R najim abdullah, Mabrouka M.A. Algherini. Enhancing Server Security: Implementation and Evaluation of the Port Knocking Method on Ubuntu Virtual Servers. J. eng. sustain. dev. [Internet]. 2025 Nov. 1 [cited 2026 Jun. 17];29(6):752-63. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/2809