The Chairperson of the Department of Mathematics Keith Promislow blocked access to the homepage of Selman Akbulut.
There are several copies of the homepage of Selman Akbulut in the Wayback Machine of the Internet Archive. Here is the link to the version of June 28, 2017, for the convenience of the readers.
Of course, this copy cannot replace the homepage, especially for the current needs. But the documents cited by Promislow as the reason for blocking are there.
There is hardly anything surprising in these actions of Promislow. In the Summer of 2016 he announced his far reaching plans to introduce strict censorship in the Department of Mathematics. See my posts