Hi @standior,
It looks like you’re trying to renew a certificate and that you have a renewal hook script configured to run /usr/sbin/ipsec, which doesn’t exist. Do you know how this could have happened? Did you follow some kind of recipe when setting up the certificate previously that would have created this hook script? Or did someone at your hosting provider create it for you?
You can probably find out more about which script this is by running something like
sudo grep -r ipsec /etc/letsencrypt