Unbound: solution for communications error

The Forward Zone

  # FORWARD ZONE (the missing part)
  forward-zone:
    name: "."
    # forward-addr: 10.15.100.111
    # forward-addr: 9.9.9.9
    # forward-addr: 1.1.1.3
    # forward-addr: 8.8.8.8
    forward-addr: 198.41.0.4@53#a.root-servers.net
    forward-addr: 170.247.170.2@53#b.root-servers.net
    forward-addr: 192.33.4.12@53#c.root-servers.net
    forward-addr: 199.7.91.13@53#d.root-servers.net
    forward-addr: 192.203.230.10@53#e.root-servers.net
    forward-addr: 192.5.5.241@53#f.root-servers.net
    forward-addr: 192.112.36.4@53#g.root-servers.net
    forward-addr: 198.97.190.53@53#h.root-servers.net
    forward-addr: 192.36.148.17@53#i.root-servers.net
    forward-addr: 192.58.128.30@53#j.root-servers.net
    forward-addr: 193.0.14.129@53#k.root-servers.net
    forward-addr: 199.7.83.42@53#l.root-servers.net
    forward-addr: 202.12.27.33@53#m.root-servers.net

    #using tls
    #don't forget to provide the valid certificate: tls-cert-bundle
    # forward-tls-upstream: yes
    # forward-addr: 198.41.0.4@853#a.root-servers.net
    # forward-addr: 170.247.170.2@853#b.root-servers.net
    # forward-addr: 192.33.4.12@853#c.root-servers.net
    # forward-addr: 199.7.91.13@853#d.root-servers.net
    # forward-addr: 192.203.230.10@853#e.root-servers.net
    # forward-addr: 192.5.5.241@853#f.root-servers.net
    # forward-addr: 192.112.36.4@853#g.root-servers.net
    # forward-addr: 198.97.190.53@853#h.root-servers.net
    # forward-addr: 192.36.148.17@853#i.root-servers.net
    # forward-addr: 192.58.128.30@853#j.root-servers.net
    # forward-addr: 193.0.14.129@853#k.root-servers.net
    # forward-addr: 199.7.83.42@853#l.root-servers.net
    # forward-addr: 202.12.27.33@853#m.root-servers.net

The result:

It’s works. Thanks.