I have two sites with 90% different content:
I had in my apache Virtualhost settings a ServerAlias for erroneus subdomains in that domain, like this: "ServerAlias *.example.com"
It worked perfectly until I have found searching my keywords for "example.com" in Google this url: "%20subdomain.example.com" linked to "http://%20subdomain.example.com" in place of my domain.
If I search for example.com it didn't appears.
This url didn't match the true subdomain without "%20" and was showing the domain.com content (duplicate content).
If I try to delete this URL from Google the form refuses this url because with this "%20" or the space that it represent is reported how "Invalid URL".
I have removed the ServerAlias, but I can't imagine how Google has listed that erroneus URL.
I think the only thing I can do is to wait for a refresh in the index.
Sorry about my bad english.
[edited by: ciml at 11:26 am (utc) on Dec. 29, 2004]
[edit reason] Examplified [/edit]