The requested URL was not found on this server [404]

Course sites have addresses of the following form: https://webcourse.cs.technion.ac.il/<course-num> (course numbers are of 6 digits)
See current list of courses in https://webcourse.cs.technion.ac.il/.

Other possible points of interest:

Note: after a few times of receiving this error, you (54.80.96.153) will be blocked completely. It is thus important that you understand why you have received this error and avoid repeating it.
For more information contact GR Admin (email: wwwb at cs technion ac il) and include the URL you have tried to access, your ID number, the course you are accessing, detailed information on the steps that can be used to recreate the problem, and the following information: "2018-09-19 04:58:44 [54.80.96.153] http://webcourse.cs.technion.ac.il".
GR++TM Security Robot v1.1