Zerotier cannot run properly on newly installed VPS

root@vps1:~# netstat -antvup
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 192.168.22.21:9993 0.0.0.0:* LISTEN 9128/zerotier-one
tcp 0 0 127.0.0.1:9993 0.0.0.0:* LISTEN 9128/zerotier-one
tcp 0 0 192.168.22.21:46956 0.0.0.0:* LISTEN 9128/zerotier-one
tcp 0 0 192.168.22.21:46957 0.0.0.0:* LISTEN 9128/zerotier-one
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 532/systemd-resolve
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 745/sshd: /usr/sbin
tcp 0 36 192.168.22.21:22 192.168.22.100:40384 ESTABLISHED 752/sshd: user01 [p
tcp6 0 0 ::1:9993 :::* LISTEN 9128/zerotier-one
tcp6 0 0 :::22 :::* LISTEN 745/sshd: /usr/sbin
udp 0 0 192.168.22.21:46956 0.0.0.0:* 9128/zerotier-one
udp 0 0 192.168.22.21:46957 0.0.0.0:* 9128/zerotier-one
udp 0 0 127.0.0.53:53 0.0.0.0:* 532/systemd-resolve
udp 0 0 192.168.22.21:9993 0.0.0.0:* 9128/zerotier-one
root@vps1:~# zerotier-cli info
**Error connecting to the ZeroTier service: **

Please check that the service is running and that TCP port 9993 can be contacted via 127.0.0.1.
root@vps1:~# uname -a
Linux vps1 5.4.0-77-generic #86-Ubuntu SMP Thu Jun 17 02:35:03 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
root@vps1:~#

hello,
usually reports like this are because the tun module isn’t loaded.
What does systemctl status zerotier-one say?

Could also be something in iptables.