● stunnel4.service - LSB: Start or stop stunnel 4.x (SSL tunnel for network daemons)
   Loaded: loaded (/etc/init.d/stunnel4; bad; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2017-11-28 12:33:11 +0330; 11min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 18117 ExecStop=/etc/init.d/stunnel4 stop (code=exited, status=0/SUCCESS)
  Process: 23506 ExecStart=/etc/init.d/stunnel4 start (code=exited, status=1/FAILURE)

Nov 28 12:33:11 Think stunnel4[23506]: [!] error queue: 140DC002: error:140DC002:SSL routines:SSL_CTX_use_certificate_chain_file:system lib
Nov 28 12:33:11 Think stunnel4[23506]: [!] error queue: 20074002: error:20074002:BIO routines:FILE_CTRL:system lib
Nov 28 12:33:11 Think stunnel4[23506]: [!] SSL_CTX_use_certificate_chain_file: 2001002: error:02001002:system library:fopen:No such file or directory
Nov 28 12:33:11 Think stunnel4[23506]: [!] Service [openvpn]: Failed to initialize SSL context
Nov 28 12:33:11 Think systemd[1]: stunnel4.service: Control process exited, code=exited status=1
Nov 28 12:33:11 Think stunnel4[23506]: failed
Nov 28 12:33:11 Think stunnel4[23506]: You should check that you have specified the pid= in you configuration file
Nov 28 12:33:11 Think systemd[1]: Failed to start LSB: Start or stop stunnel 4.x (SSL tunnel for network daemons).
Nov 28 12:33:11 Think systemd[1]: stunnel4.service: Unit entered failed state.
Nov 28 12:33:11 Think systemd[1]: stunnel4.service: Failed with result 'exit-code'.