man wget diz
-D domain-list
--domains=domain-list
Set domains to be followed. domain-list is a comma-separated list
of domains. Note that it does not turn on -H.
Observe também que wget do GNU abrangendo hosts diz
Wget’s recursive retrieval normally refuses to visit hosts different than the one you specified on the command line. This is a reasonable default; without it, every retrieval would have the potential to turn your Wget into a small version of google.
Então talvez você esteja usando -H por algum motivo?
Limit spanning to certain domains—‘-D’
The ‘-D’ option allows you to specify the domains that will be followed, thus limiting the recursion only to the hosts that belong to these domains. Obviously, this makes sense only in conjunction with ‘-H’. A typical example would be downloading the contents of ‘www.example.com’, but allowing downloads from ‘images.example.com’, etc.:
wget -rH -Dexample.com http://www.example.com/