Can't bind to 'routerLink' since it isn't a known property

Source: https://stackoverflow.com/questions/42035387/cant-bind-to-routerlink-since-it-isnt-a-known-property

You need to add RouterModule to imports of every @NgModule() where components use any component or directive from (in this case routerLink and <router-outlet>.
declarations: [] is to make components, directives, pipes, known inside the current module.
exports: [] is to make components, directives, pipes, available to importing modules. What is added to declarations only is private to the module. exports makes them public.

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Check to be sure that port 22 is enabled before you reload

 https://superuser.com/questions/590600/ufw-is-active-but-not-enabled-why etting  ENABLED=yes  in  /etc/ufw/ufw.conf  did it for me. $ sudo ...