Конфиг /etc/gogoc/gogoc.conf околодефолтный (если не считать опций userid, passwd, server), с которым раньше всё работало. В логах где-то с полгода-год назад началось такое:
2016/10/01 11:51:07 I gogoc: Disconnected. Retrying in 300 seconds.
2016/10/01 11:56:07 I gogoc: Establishing connection to server amsterdam.freenet6.net using reliable UDP.
2016/10/01 11:56:07 I gogoc: Using TSP protocol version 2.0.2.
2016/10/01 11:56:07 I gogoc: Retrieving TSP capabilities from Server.
2016/10/01 11:56:07 I gogoc: RUDP packet 0, RTO 2.000000, sequence 0xf00000f0 timestamp 410.
2016/10/01 11:56:09 I gogoc: No RUDP reply.
2016/10/01 11:56:09 I gogoc: RUDP packet 1, RTO 2.000000, sequence 0xf00000f0 timestamp 2412.
2016/10/01 11:56:11 I gogoc: No RUDP reply.
2016/10/01 11:56:11 I gogoc: RUDP packet 2, RTO 2.000000, sequence 0xf00000f0 timestamp 4414.
2016/10/01 11:56:13 I gogoc: No RUDP reply.
2016/10/01 11:56:13 E gogoc: Failed to contact TSP listener at amsterdam.freenet6.net.
2016/10/01 11:56:13 I gogoc: Disconnected. Retrying in 300 seconds.