@olalonde GFW is known to tighten the control on national holidays or any event they see fit. The day after Tianjin explosion, IKEV2 stopped working for 1 day on my network (I was in Beijing). PPTP from time to time suffer the same issue though I couldn't say when. Also check your ip location, I found out one provider was having reliable PPTP connection about a week ago, and it turned out they were just relaying traffic in a data center in China. Those traffic are not blocked by GFW as long as it is domestic and I could only imagine that data center simply forwarded the traffic onward using other means.
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