You can also close your forum, and set the general "Forum Closed" message, from
"Master Settings" -> "Primary Settings" -> "General Tab"

You are given two options:
"Close Board?" - Which closes your forum (just like the link on the CP Landing page)
"Closed Message" - This is where you set the body of the closed message that your users will see.

I am a Web Development Contractor, I do not work for UBBCentral. I have provided free User to User Support since the beginning of these support forums.
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