run this inside jail: tail -f /var/log/openvpn.log
then connect to vpn and try to access google.com and check the log to see what happens
also please export jail config (from FreeNAS) and post it here:
iocage get --all OpenVPN
root@OpenVPN:/usr/local/etc/openvpn # tail -f /var/log/openvpn.log
Mar 22 15:05:36 OpenVPN openvpn[44644]: Marcelo/72.47.31.156:47828 MULTI_sva: pool returned IPv4=10.8.0.6, IPv6=(Not enabled)
Mar 22 15:05:36 OpenVPN openvpn[44644]: Marcelo/72.47.31.156:47828 MULTI: Learn: 10.8.0.6 -> Marcelo/72.47.31.156:47828
Mar 22 15:05:36 OpenVPN openvpn[44644]: Marcelo/72.47.31.156:47828 MULTI: primary virtual IP for Marcelo/72.47.31.156:47828: 10.8.0.6
Mar 22 15:05:36 OpenVPN openvpn[44644]: Marcelo/72.47.31.156:47828 PUSH: Received control message: 'PUSH_REQUEST'
Mar 22 15:05:36 OpenVPN openvpn[44644]: Marcelo/72.47.31.156:47828 SENT CONTROL [Marcelo]: 'PUSH_REPLY,route 192.168.0.1 255.255.255.0,redirect-gateway def1 bypass-dhcp,route 10.8.0.1,topology net30,ping 10,ping-restart 120,ifconfig 10.8.0.6 10.8.0.5,peer-id 0,cipher AES-256-GCM' (status=1)
Mar 22 15:05:36 OpenVPN openvpn[44644]: Marcelo/72.47.31.156:47828 Data Channel: using negotiated cipher 'AES-256-GCM'
Mar 22 15:05:36 OpenVPN openvpn[44644]: Marcelo/72.47.31.156:47828 Outgoing Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
Mar 22 15:05:36 OpenVPN openvpn[44644]: Marcelo/72.47.31.156:47828 Incoming Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
Mar 22 15:05:59 OpenVPN openvpn[44644]: Marcelo/72.47.31.156:47828 SIGTERM[soft,remote-exit] received, client-instance exiting
Mar 22 15:39:44 OpenVPN openvpn[44644]: TLS Error: cannot locate HMAC in incoming packet from [AF_INET6]::ffff:185.200.118.68:48705
root@MarceloFlix[~]# iocage get --all OpenVPN
CONFIG_VERSION:26
allow_chflags:0
allow_mlock:0
allow_mount:0
allow_mount_devfs:0
allow_mount_fusefs:0
allow_mount_nullfs:0
allow_mount_procfs:0
allow_mount_tmpfs:0
allow_mount_zfs:0
allow_quotas:0
allow_raw_sockets:1
allow_set_hostname:1
allow_socket_af:0
allow_sysvipc:0
allow_tun:1
allow_vmm:0
assign_localhost:0
available:readonly
basejail:0
boot:1
bpf:0
children_max:0
cloned_release:11.3-RELEASE
comment:none
compression:lz4
compressratio:readonly
coredumpsize: off
count:1
cpuset: off
cputime: off
datasize: off
dedup: off
defaultrouter:192.168.0.1
defaultrouter6:auto
depends:none
devfs_ruleset:5
dhcp:0
enforce_statfs:2
exec_clean:1
exec_created:/usr/bin/true
exec_fib:0
exec_jail_user:root
exec_poststart:/usr/bin/true
exec_poststop:/usr/bin/true
exec_prestart:/usr/bin/true
exec_prestop:/usr/bin/true
exec_start:/bin/sh /etc/rc
exec_stop:/bin/sh /etc/rc.shutdown
exec_system_jail_user:0
exec_system_user:root
exec_timeout:60
host_domainname:none
host_hostname:OpenVPN
host_hostuuid:OpenVPN
host_time:1
hostid:a0f41863-2cb8-11e5-b42e-d05099785ff9
hostid_strict_check:0
interfaces:vnet0:bridge0
ip4:new
ip4_addr:192.168.0.15/24
ip4_saddrsel:1
ip6:new
ip6_addr:none
ip6_saddrsel:1
ip_hostname:0
jail_zfs:0
jail_zfs_dataset:iocage/jails/OpenVPN/data
jail_zfs_mountpoint:none
last_started:2020-03-22 20:05:08
localhost_ip:none
login_flags:-f root
mac_prefix:02ff60
maxproc: off
memorylocked: off
memoryuse: off
mount_devfs:1
mount_fdescfs:1
mount_linprocfs:0
mount_procfs:0
mountpoint:readonly
msgqqueued: off
msgqsize: off
nat:0
nat_backend:ipfw
nat_forwards:none
nat_interface:none
nat_prefix:172.16
nmsgq: off
notes:none
nsem: off
nsemop: off
nshm: off
nthr: off
openfiles: off
origin:readonly
owner:root
pcpu: off
plugin_name:none
plugin_repository:none
priority:99
pseudoterminals: off
quota:none
readbps: off
readiops: off
release:11.3-RELEASE-p6
reservation:none
resolver:/etc/resolv.conf
rlimits: off
rtsold:0
securelevel:2
shmsize: off
stacksize: off
state:up
stop_timeout:30
swapuse: off
sync_state:none
sync_target:none
sync_tgt_zpool:none
sysvmsg:new
sysvsem:new
sysvshm:new
template:0
type:jail
used:readonly
vmemoryuse: off
vnet:1
vnet0_mac:02ff609bc87f 02ff609bc880
vnet1_mac:none
vnet2_mac:none
vnet3_mac:none
vnet_default_interface:auto
vnet_interfaces:none
wallclock: off
writebps: off
writeiops: off