I happened to be just passing through the University of Technology, Sydney (UTS) and tried editing the Wikipedia there. This is the message I got:
secure login This account or IP address has been blocked from editing. You were blocked by Proxy blocker for the following reason (see our blocking policy): Your IP address has been blocked because it is an open proxy. Please contact your Internet service provider or tech support and inform them of this serious security problem. Editing Wikipedia through an open proxy is not allowed; see this policy for details.
Your IP address is 138.25.2.22.
I asked IT support, but they said it was unlikely to change, because 35,000 students had to be catered to (and I guess, they have their way of accessing the server).
All the same, isn't it sad that the students who might want to contribute to the Wikipedia can't do so? Is there some solution? Regards, FN (based otherwise in Goa, India)