Iran has blocked the use of virtual private network (VPN) systems in the country, unless approved for use by the authorities, in a move to further clamp down on dissidents in the region.
According to a report on Reuters a local news agency in the region Mehr confirmed that a government minister announced the block on Sunday.
"Within the last few days illegal VPN ports in the country have been blocked," the head of parliament's information and communications technology committee, Ramezanali Sobhani-Fard, said.
"Only legal and registered VPNs can from now on be used."
This will undoubtedly mean the systems in use are monitored by the authorities, again curtailing the ability for those opposed to the regime to contact one another or the outside world.
Tools such as Facebook and Skype have proved popular in the past but the Iranian authorities have taken steps to curb their use in the run up to elections later this year.
A report published last week by UK right's organisation Small Media noted this crackdown by the authorities.
"As the June election approaches and the internal politics of the government becomes more continuous, Iran's internet connectivity, and the accessibility of uncensored information, continues to deteriorate," it said.
"Prominent Persian-language websites and other online services have been filtered one by one, and communications with external platforms is becoming progressively more difficult.
"From a technical perspective, few things have been changed in recent months."
Iran's own networks have themselves been targeted by outside agents in recent years, with several advanced malware threats uncovered targeting its systems in an apparent move to cripple its nuclear programmes.
We sacrificed our weekend to try out the new Vikendi map coming to PUBG - and rather liked it
12 of the 32 stars observed feature rings and gaps that are usually carved by planets in the process of formation
The experiment is currently underway at South Korea's Yangyang Underground Laboratory
Exoplanet HAT-P-11b is located about 124 light years from Earth