Something is apparently causing your vpnserver to get stuck starting. What's in your System Log during the server start?
Here is the entire log from when I tried a restart of the server. Other entries mixed in are the result of Skynet blocking certain IPs. MAC address have been partially erased for security.
Jun 25 16:26:15 rc_service: skip the event: restart_letsencrypt.
Jun 25 16:26:17 kernel: [BLOCKED - INBOUND] IN=eth0 OUT= MAC=:26:82:b8:20:00:01:5c:71:b8:46:08:00 SRC=178.19.107.42 DST=71.203.10.63 LEN=40 TOS=0x00 PREC=0x20 TTL=234 ID=48551 PROTO=TCP SPT=40902 DPT=8545 SEQ=2539165433 ACK=0 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Jun 25 16:26:18 kernel: [BLOCKED - INBOUND] IN=eth0 OUT= MAC=:26:82:b8:20:00:01:5c:71:b8:46:08:00 SRC=185.176.26.18 DST=71.203.10.63 LEN=40 TOS=0x00 PREC=0x20 TTL=238 ID=47107 PROTO=TCP SPT=46045 DPT=3210 SEQ=3173236406 ACK=0 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Jun 25 16:27:00 rc_service: service 14806:notify_rc restart_letsencrypt
Jun 25 16:27:00 rc_service: waitting "restart_chpass;restart_vpnserver1" via httpd ...
Jun 25 16:27:15 rc_service: skip the event: restart_letsencrypt.
Jun 25 16:28:00 rc_service: service 14866:notify_rc restart_letsencrypt
Jun 25 16:28:00 rc_service: waitting "restart_chpass;restart_vpnserver1" via httpd ...
Jun 25 16:28:15 rc_service: skip the event: restart_letsencrypt.
Jun 25 16:29:00 rc_service: service 14925:notify_rc restart_letsencrypt
Jun 25 16:29:00 rc_service: waitting "restart_chpass;restart_vpnserver1" via httpd ...
Jun 25 16:29:15 rc_service: skip the event: restart_letsencrypt.
Jun 25 16:29:15 kernel: [BLOCKED - INBOUND] IN=eth0 OUT= MAC=:26:82:b8:20:00:01:5c:71:b8:46:08:00 SRC=194.61.24.187 DST=71.203.10.63 LEN=40 TOS=0x00 PREC=0x20 TTL=233 ID=25374 PROTO=TCP SPT=44334 DPT=33899 SEQ=1148710218 ACK=0 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000