Is it permissible for a government employee to use the internet network available at the workplace to access their university lectures remotely, knowing that this does not affect their work performance?

The permissibility of using the internet network designated for work during working hours depends on the permission of the employer. This is because the right belongs to the employer in this matter. If permission is granted, then it is permissible, whether the permission is explicit or customary. This is because using it involves spending some of the working hours on matters unrelated to work and using work tools for personal purposes. Neither of these is permissible except with the employer's permission.