Hi Markus,
I have the same problem with ISP, it has anomalous behavior from yesterday.
ISP is blocking everything that normally worked. The OpenVPN client also detects it as a trojan
01/14/2018-19:12:12.641205 [Drop] [**] [1:2009206:4] ET TROJAN Possible Downadup/Conficker-C P2P encrypted traffic UDP Ping Packet (bit value 4) [**] [Classification: A Network Trojan was detected] [Priority: 1] {UDP} ...
ISP had never done it before.