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The DNSBL related settings are broken.

If you're detected as being blacklisted, the following happens:

                                        $this->mBlockedby = wfMsg( 'sorbs' );
                                        $this->mBlockreason = wfMsg( 'sorbsreason' );

However, the actual methods to see if your blocked look for $this->mBlock being a real block object. Hence you're not actually blocked.

Not sure what the cleanest solution would be. either change relavent methods of user to not look for $this->mBlock, or introduce a new FakeBlock class for cases where the user doesn't have a block in db, but is blocked.