This may be part of the new Ministry of Industry and Information Technology rule set announced earlier this year in which the use or operation of VPN software without the permission of The government is considered illegal.
According to the ministry, 'all the special VPN and cable services on the continent must be approved by the Government, making it possible for most domestic VPN service providers to serve 730 million users to become unlawful.'
The suspension of the VPN service is used to 'enhance the bearing of information security management,' the ministry said. However, this is not yet one of the priorities for online content control in China.