Looked at the log:
2017/04/02 15:16:13 [alert] 7544#4756: the event "ngx_master_7544" was not signaled for 5s
2017/04/02 15:16:13 [alert] 7544#4756: could not respawn worker
2017/04/02 17:33:36 [alert] 1188#2220: worker process 6364 exited with code C0000142
2017/04/02 17:33:36 [alert] 1188#2220: could not respawn worker
2017/04/02 17:33:37 [alert] 1188#2220: worker process 6752 exited with code C0000142
2017/04/02 17:33:37 [alert] 1188#2220: could not respawn worker
openssl rsa -in f:/ssl.key -out f:/ssl.key.unsecure
Try it
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