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We could try a proof of troll system, keep randomly saying the same thing over and over and every time a new variation is found its a new block. Save the end of the world prophesies for the speculation subforum please.
Noticed the same with the ISP's, Ireland's really lax on internet rights and there's lots of weird stuff going on, outages followed by slowdowns on certain sites, everything loading fine except images taking ages, that kind of thing. Obvious what's going on, lots of sites seem to be going offline lately, nothing big but a lot crypto related.
Have to get back onto my ISP again now, hadn't realised they'd blocked 8333 again. Second time they've done that, will have to route out to a VPS. That's what the dumbasses don't get, that which doesn't kill us makes us stronger.
Many ISPs, used advanced filtering products to protect their network and clients like
http://www.cisco.com/c/en/us/products/security/security-monitoring-analysis-response-system/index.html , so even if they aren't overtly blocking TCP on port 8333 but their firewalls and filters are because it is detecting a suspicious transfer.
You can test for 8333 being opened here -
http://www.yougetsignal.com/tools/open-ports/ and if you don't have more than 8 connection in bitcoin QT you are not accepting any incoming connections on port 8333.
Sometimes its a local firewall blocking you or you need to either allow UPnP or port forward to get QT functioning as a full node but in many other cases its the ISP themselves.
Regardless of the exact specifics with each case, most users aren't acting as a full node and the numbers back my claim. The average user isn't going to call their ISP , or create a forwarding rule in their router and make sure their firewall is configured properly.