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We have a WPMU instance: http://my.blogs.com/blog1 http://my.blogs.com/blog2

Now, blog1 is closed to used registration, while blog2 us open to users registering and posting.

now, how do I get to have a user added to only blog2 when he signs up ? as of now, he is not added to any blog and only this.

Now, if I have blog3, which also has registration enabled, how could a user signup only to that ?

Is there a plugin that can detect the blog URI and add the user only to that ?

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Are you using old WPMU or new WordPress 3.0+ Network? In new WordPress, I don't think you would have any problems. The user gets a default role as per that sub-blog's settings. What do you see on user's admin screen. Do they actually show membership where they do not belong? – Alexandre Rafalovitch Aug 25 '10 at 3:49
I am running 2.7.2. I am in the process of upgrading to 3.0. When the user signsup, his account is created.. but he is not associated with any blog. – Ramprasad Prabhakar Aug 25 '10 at 15:08
he is assigned to my.blogs.com – Ramprasad Prabhakar Aug 25 '10 at 15:10

IIRC a User sings up on a multisite setup, he basically signs up on all sites. So that User is available to all sites whatever you do. But I can not see anything bad with that.

Maybe you need to specify why you want to block the User from using your multisite? What's wrong with that?

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