[INFO] [2018-01-09T17:18:26+01:00] Set target to 918387dad1e468f570415ac397d96646bae0ad99dbe78033de028099e46e0700
[INFO] [2018-01-09T17:18:26+01:00] Received new job 39
[INFO] [2018-01-09T17:18:26+01:00] Accepted share #192
[INFO] [2018-01-09T17:18:26+01:00] Accepted share #193
[INFO] [2018-01-09T17:18:26+01:00] Accepted share #194
[INFO] [2018-01-09T17:18:26+01:00] Accepted share #195
[INFO] [2018-01-09T17:18:26+01:00] Accepted share #196
[INFO] [2018-01-09T17:18:26+01:00] Accepted share #197
[INFO] [2018-01-09T17:18:26+01:00] Accepted share #198
[INFO] [2018-01-09T17:18:26+01:00] Set target to 54734c9f97375c7b0eb318eb75223b511137db8943bb58ec157d4becf5f30000
[INFO] [2018-01-09T17:18:26+01:00] Received new job 3a
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #199 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #200 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #201 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #202 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #203 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #204 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #205 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #206 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #207 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #208 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #209 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #210 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #211 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #212 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #213 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Rejected share #214 ([21,"job not found"])
[WARN] [2018-01-09T17:18:26+01:00] Get error: Too many rejected shares, resetting in 5 seconds
[WARN] [2018-01-09T17:18:31+01:00] Connection failed due to End of file, retrying in 5 seconds
[INFO] [2018-01-09T17:18:31+01:00] Connected to zen.suprnova.cc:3618
[INFO] [2018-01-09T17:18:36+01:00] Subscribed to stratum server
[INFO] [2018-01-09T17:18:36+01:00] Set nonce to 5e39000000000000000000000000395f
[INFO] [2018-01-09T17:18:36+01:00] Set target to 0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f00
[INFO] [2018-01-09T17:18:36+01:00] Received new job 3e
[WARN] [2018-01-09T17:18:36+01:00] Get error: A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied., resetting in 5 seconds
[INFO] [2018-01-09T17:18:36+01:00] Connected to zen.suprnova.cc:3618
[INFO] [2018-01-09T17:18:41+01:00] Subscribed to stratum server
[INFO] [2018-01-09T17:18:41+01:00] Set nonce to e40a0008000000000000000008000ae5
[INFO] [2018-01-09T17:18:41+01:00] Set target to 0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f00
[INFO] [2018-01-09T17:18:41+01:00] Received new job 3e
[WARN] [2018-01-09T17:18:41+01:00] Rejected share #349 ([24,"unauthorized worker",null])
[WARN] [2018-01-09T17:18:41+01:00] Get error: A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied., resetting in 5 seconds
[INFO] [2018-01-09T17:18:41+01:00] Connected to zen.suprnova.cc:3618
[INFO] [2018-01-09T17:18:46+01:00] Subscribed to stratum server
[INFO] [2018-01-09T17:18:46+01:00] Set nonce to d6ceff47000000000000000047ffced5
[INFO] [2018-01-09T17:18:46+01:00] Set target to 0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f00
[INFO] [2018-01-09T17:18:46+01:00] Received new job 3e
[WARN] [2018-01-09T17:18:46+01:00] Get error: A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied., resetting in 5 seconds
[INFO] [2018-01-09T17:18:46+01:00] Connected to zen.suprnova.cc:3618
It happened again, any idea what this could be?
It seems to me that you haven't specified the password in the URI. As a result suprnova is rejecting the connection. Adding the password works for me.