ポート80を22に再マッピング

ポート80から着信要求をポート22に再マップし、次のことを試みました。sudo iptables -A PREROUTING -t nat -p tcp --dport 80 -j REDIRECT --to-ports 22しかし、まだssh -i key user@host -p 80接続できません。なぜ知りたくないのですか？

編集1

$ sudo iptables-save -c
sudo: unable to resolve host DevRon
# Generated by iptables-save v1.6.0 on Mon Sep  3 00:23:20 2018
*nat
:PREROUTING ACCEPT [21:1260]
:INPUT ACCEPT [21:1260]
:OUTPUT ACCEPT [254:15716]
:POSTROUTING ACCEPT [254:15716]
[0:0] -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 22
[0:0] -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 22
[0:0] -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
COMMIT
# Completed on Mon Sep  3 00:23:20 2018
# Generated by iptables-save v1.6.0 on Mon Sep  3 00:23:20 2018
*filter
:INPUT ACCEPT [41307:2896000]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [41123:2886089]
COMMIT
# Completed on Mon Sep  3 00:23:20 2018