Iran blocks use of tool to get around Internet filter

DUBAI - Iranian authorities have blocked the use of most "virtual private networks", a tool that many Iranians use to get around an extensive government Internet filter, Iranian media quoted an official as saying on Sunday.
A widespread government Internet filter prevents Iranians from accessing many sites on the official grounds they are offensive or criminal.
Many Iranians evade the filter through use of VPN software, which provides encrypted links directly to private networks based abroad, and can allow a computer to behave as if it is based in another country.