Over the past few months the government has been steadily blocking all VPNs and other methods used to bypass their attempts to stifle free speech.
The latest roll out has restricted access to the TOR network, although folks are working on a fix to keep access open.
You could try one of the commercial VPNs available, Private Internet Access still works and is pretty cheap - just Google it.
Alan is also correct, there has been further restrictions imposed due to terrorist incidents.
The joys of living in a virtual dictatorship...
JF