Excuse me I have misled you. The url generated for blogs is /root_site_name/pageName/BlogName/2011/11/21/postName. I suppose /blog is the name of the page where the blogs widget is placed.
The url for "multiple url" should be " /cms/post123/ ". If you need the url to redirect back to the url of the Sitefinity 4 blog there is a checkbox "All additional URLs redirect to the default one:" under multiple url textbox.
Can you share with me the settings you have for multiple urls and what is the desired functionality if I have misunderstood your request?
The changed settings are reflected in configurations. Go to App_Data/Sitefinity/Configuration/BlogsConfig and change the provider name back to /Blogs.
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