According to NASA, the James Webb Space Telescope Team is addressing communication issues between the telescope and the launch vehicle system (Ariane 5). In this case, the launch date will be postponed by another 2 days, no earlier than Friday, December 24. NASA may provide more information about the new release date by December 17.
James Webb telescope in the rocket vertical assembly workshop (Source: ESA-M. Pedoussaut)
Prior to that, on December 11, the James Webb Space Telescope had been fixed to the top of the Ariane 5 rocket. The entire "loading" process is one of the most rigorous operations in the launch process, and the telescope is carried out in a strictly safe and clean environment. A custom-made transparent cord was used as a barrier against dust, and technicians carefully attached Weber to its launch vehicle inside.
The James Webb telescope in hoisting the fit (Source: ESA-M. Pedoussaut)
Next, European Space Agency engineers will encapsulate the James Webb Space Telescope into a giant fairing tailored for it by the Ariane 5 launch vehicle.