openwrt no ssh from wan

I would like to have access from wan through ssh to my openwrt router. I did the following: - Go to the Network / Firewall / Traffic Rules. - Scroll down to the “Open ports on router” section. - Enter a name for this rule, e.g. “Allow-SSH-WAN”. - Set “Protocol” to “TCP”. - Enter “22” as the “External Port”. - Click “Add”. - Click “Save and Apply”. Unfortunately ssh root@myWANip does not answer. What did I miss?