I thought I should chime in with some info about Psiphon's recent blockage in Iran...
On February 14, we had about 840K Android + 620K Windows unique users (on that day; the total for the preceding week was about 3m, as Collin said). This is almost the high water mark for us. On February 15, we were down to 500K Android users + 400K Windows users. On February 16, we were down to 150K Android users + 180K Windows users. Unsurprisingly, we were also getting hammered with user feedback (about 10x normal) and email auto-responder requests (at least 5x normal) -- tens of thousands of both. So, yeah, Iran dropped the hammer on us. There's a very good chance that this is related to the anniversary of the Iranian Revolution -- which is February 11, but there are other dates in the vicinity (e.g., the house arrests of the opposition leaders was Feb 14). The Fars news agency (which is believed to be a tool of Iran's Revolutionary Guard Corps) published an article (< http://www.farsnews.com/newstext.php?nn=13921129001173>) on February 18 which said: "A reliable source in contact with Fars news agency, talked about blocking of Psiphon since three days ago. He also talked about blocking of Chrome extension "Zenmate" and also mentioned the plan to block 8 other circumvention tools." (Thanks to Fereidoon@ASL19 for the translation and Revolution info.) Our (and Collin's) investigation results have been difficult to interpret (and/or get solid knowledge from), but we've seen some of our IPs that are blocked across all ports, and some that are blocked just on the ports we use for SSH/OSSH/VPN. (It might be that it varies by ISP.) We suspect that the censors might have been collecting our IPs for a while and then blocked a bunch all at once. New servers/IPs that we've created since the blocking seem to work, so the blocking is probably not DPI-based. However, many new IPs are still getting blocked faster than normal, so it seems that Iran's censors are still being very aggressive. As of yesterday we've managed to recover a bit to 280K Android users + 250K Windows users. We are pumping out new servers and working on new ideas for dealing with new blockage events (and maybe this one, if it keeps going strong). ...And that's where we are now. If anyone has any questions, ideas, info, etc., please let us know. --- I also feel I should comment on a couple of things that Nathan said: > If Tor is harder to block (which it is) ... > That is the reason I promote Tor. ... i see it as something you can trust and rely upon that wont leave user out to dry the minute the govt filters their IP. I would advise against getting too comfortable/confident/hubristic. Tor has 2000 bridges and we were up to over a 1000 IPs. Tor has a bridge discovery mechanism and Psiphon has a server discovery mechanism. Tor has an obfuscated protocol and Psiphon has an obfuscated protocol. There are enormous differences, of course, but if Tor gets to a million Iranian users and then the censors decide specifically and publicly to target it... One might not want to suggest that one is unblockable. -- Adam Pritchard Psiphon Inc.
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