To no one's surprise, Google has confirmed that Iran is indeed blocking services that use SSL, at least part of them but probably all, but also other services such as YouTube. The move comes after plenty of similar attempts by the authorities there.
There are even plans to build an alternative internet that would work only inside Iran. As recent as January, officials claimed that such a network was on its way of being deployed within months.
For the time being, it seems that all external websites that use HTTPS by default are being blocked. Such sites that are housed in Iran are said to be working.
In Google's case, encrypted search, Gmail, Google Videos and YouTube are confirmed to be blocked. The company says these websites stopped working in the country on February 10th.