The paper-based IELTS has been suspended in Iran since August 1. Some test-takers have been told that the suspension is due to concerns about cheating at test centers. The computer based version (also delivered at test centers) is still available, and registrants for the paper version can switch for free.
People in Iran are frustrated, as testing has been a real challenge in their country for some time. As I wrote in March, seemingly hundreds of individuals who took the TOEFL iBT Test in Iran faced unexpected cancellations of their scores. Some received notice of the cancellations months after taking the test, and lost offers of admission to prestigious schools abroad.