Harry: "Why can't we get through?"
Ron: "Dunno. The barrier's sealed itself for some reason."
— Description[src]

Blocked Barrier[1] was a Charm (incantation unknown) that could be used to seal magical barriers and portals of the like used by witches and wizards to limit access to magical locations.


In September of 1992, the house elf Dobby used this charm to block the barrier to Platform Nine and Three-Quarters, therefore preventing Harry Potter and Ronald Weasley from using it, as part of his plot to try to save Harry from the opening of the Chamber of Secrets.


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