I am on 4.1c Phoenix and constantly from yesterday night have this problem with eu server.
I can mine on us1.

2019.01.25:11:26:06.992: main Eth: the pool list contains 1 pool (1 from command-line)
2019.01.25:11:26:06.992: main Eth: primary pool: ssl://eu1.ethermine.org:5555
2019.01.25:11:26:06.992: main Starting GPU mining
2019.01.25:11:26:06.993: wdog Starting watchdog thread
2019.01.25:11:26:07.432: main Eth: Connecting to ethash pool ssl://eu1.ethermine.org:5555 (proto: QtMiner)
2019.01.25:11:26:07.455: eths Eth: Connected to SSL ethash pool eu1.ethermine.org:5555 (172.65.207.106)
2019.01.25:11:26:07.481: eths Eth: Send: {"id":1,"jsonrpc":"2.0","method":"eth_login","params":["xxx.rig1"]}

2019.01.25:11:26:07.556: eths Eth: Connection closed by the pool
2019.01.25:11:26:07.556: eths Eth: Reconnecting in 20 seconds...
2019.01.25:11:26:07.633: main Listening for CDM remote manager at port 3333 in read-only mode
2019.01.25:11:26:07.633: main GPU1: 38C 0%, GPU2: 41C 0%, GPU3: 35C 0%, GPU4: 35C 0%, GPU5: 40C 0%, GPU6: 39C 0%
2019.01.25:11:26:27.562: unkn Eth: Connecting to ethash pool ssl://eu1.ethermine.org:5555 (proto: QtMiner)
2019.01.25:11:26:27.572: eths Eth: Connected to SSL ethash pool eu1.ethermine.org:5555 (172.65.207.106)
2019.01.25:11:26:27.597: eths Eth: Send: {"id":1,"jsonrpc":"2.0","method":"eth_login","params":["xxx.rig1"]}

2019.01.25:11:26:27.659: eths Eth: Connection closed by the pool
2019.01.25:11:26:27.659: eths Eth: Reconnecting in 20 seconds...
2019.01.25:11:26:35.560: main GPU1: 37C 0%, GPU2: 40C 0%, GPU3: 32C 0%, GPU4: 33C 0%, GPU5: 38C 0%, GPU6: 38C 0%
2019.01.25:11:26:47.663: unkn Eth: Connecting to ethash pool ssl://eu1.ethermine.org:5555 (proto: QtMiner)
2019.01.25:11:26:47.672: eths Eth: Connected to SSL ethash pool eu1.ethermine.org:5555 (172.65.207.106)
2019.01.25:11:26:47.696: eths Eth: Send: {"id":1,"jsonrpc":"2.0","method":"eth_login","params":["xxx.rig1"]}