I read this and I wondered why it is has a passive construction, as if the challenges and vulnerabilities were some sort of act of nature. Here's how I would re-write this (I know it's now as tidy.):
Technology gives teachers and students unprecedented powers--to collaborate, to connect, to collect information, and to publish--but too often, school district administrators and IT personnel seek to control, block, and restrict these new powers.
I think it's important to remember that there are people in powerful positions who are responsible for many of the challenges and vulnerabilities that teachers face when they teach with new technologies.