Connection error with HTTP challenges

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10

HAProxy nor Certbot running:

~$ sudo ss -tlp
State       Recv-Q Send-Q                               Local Address:Port                                                Peer Address:Port
LISTEN      0      128                                              *:ssh                                                            *:*                     users:(("sshd",pid=1232,fd=3))
LISTEN      0      128                                             :::ssh                                                           :::*                     users:(("sshd",pid=1232,fd=4))

HAProxy running:

~$ sudo ss -tlp
State       Recv-Q Send-Q              Local Address:Port                               Peer Address:Port
LISTEN      0      128                             *:http                                          *:*                     users:(("haproxy",pid=2619,fd=5))
LISTEN      0      128                             *:ssh                                           *:*                     users:(("sshd",pid=1232,fd=3))
LISTEN      0      128                             *:https                                         *:*                     users:(("haproxy",pid=2619,fd=6))
LISTEN      0      128                            :::ssh                                          :::*                     users:(("sshd",pid=1232,fd=4))

Certbot running:

~$ sudo ss -tlp
State       Recv-Q Send-Q              Local Address:Port                               Peer Address:Port
LISTEN      0      128                             *:ssh                                           *:*                     users:(("sshd",pid=1232,fd=3))
LISTEN      0      5                              :::http                                         :::*                     users:(("certbot",pid=2553,fd=8))
LISTEN      0      128                            :::ssh                                          :::*                     users:(("sshd",pid=1232,fd=4))

and it looks like sudo can bind to port 80:

~$ sudo nc -vvv -l -p80
Listening on [0.0.0.0] (family 0, port 80)
^C

:~$ sudo ss -tlp
State      Recv-Q Send-Q                                     Local Address:Port                                                      Peer Address:Port
LISTEN     0      1                                                      *:http                                                                 *:*                     users:(("nc",pid=5397,fd=3))
LISTEN     0      128                                                    *:ssh                                                                  *:*                     users:(("sshd",pid=1232,fd=3))
LISTEN     0      128                                                   :::ssh                                                                 :::*                     users:(("sshd",pid=1232,fd=4))