On 6/7/16 4:00 AM, Rob Janssen wrote:
We also offer OpenVPN connectivity at our gateway, in UDP mode only, and this too is problem-free w.r.t. ISP routers. I don't believe a provider would (or even can?) filter OpenVPN, certainly not when it would be run in TCP mode on port 443.
I haven't run in to 443 "filtering", but I have run into instances where the ISP will drop TCP connections that are active for more than a few minutes, forcing openvpn to restart the connection.