Nvt sync script

Hi I installed openvas on Ubuntu 20.04. When I run greenbone-nvt-sync the script stopped (with this error Connection refused) at this line and if I tried to re-run the script but it do nothing:
report_formats/fae2d2f8-2a7a-11e2-b646-001f29eadec8.asc
230 100% 0.22kB/s 0:00:01 (xfr#59863, to-chk=0/60608)

sent 1,145,002 bytes received 275,471,743 bytes 204,825.43 bytes/sec
total size is 270,428,720 speedup is 0.98
rsync: failed to connect to feed.community.greenbone.net (45.135.106.142): Connection refused (111)
rsync: failed to connect to feed.community.greenbone.net (2a0e:6b40:20:106:20c:29ff:fe67:cbb5): Network is unreachable (101)
rsync error: error in socket IO (code 10) at clientserver.c(127) [Receiver=3.1.3]
Please could you help me to solve this problem? Thank you

You are not connected to the internet, as well your legacy connection seems to be firewalled / filtered as well !

You can check with rsync if your connection is ok by enter rsync:

rsync rsync://feed.community.greenbone.net

Greenbone community feed server - http://feed.community.greenbone.net/
This service is hosted by Greenbone Networks - http://www.greenbone.net/

All transactions are logged.

If you have any questions, please use the Greenbone community portal.
See https://community.greenbone.net for details.

By using this service you agree to our terms and conditions.

Only one sync per time, otherwise the source ip will be temporarily blocked.

data-objects Greenbone community data objects, see https://community.greenbone.net/
nvt-feed Greenbone community NVT feed, see https://community.greenbone.net/
scap-data Greenbone community SCAP data feed, see https://community.greenbone.net/
cert-data Greenbone community CERT data feed, see https://community.greenbone.net/
nvt-feed-new TESTING Greenbone community NVT feed, see https://community.greenbone.net/
scap-data-new TESTING Greenbone community SCAP data feed, see https://community.greenbone.net/
cert-data-new TESTING Greenbone community CERT data feed, see https://community.greenbone.net/