What is "TSIG invalid"?

[HeePok Lee]

Hi ! all.

I upgraded BIND8.2.2 from BIND 8.2.1.
By the way when I do zone transfer with Dig command,
it show like this.

$ORIGIN lgeac.co.kr.
@                       10M IN SOA      crknadmin.crkn.co.kr.
Administrator.crkn.co.kr. (
                                        6               ; serial
                                        10M             ; refresh
                                        10M             ; retry
                                        1D              ; expiry
                                        10M )           ; minimum

; TSIG invalid
                        10M IN NS       crknadmin.crkn.co.kr.
; TSIG invalid
www                     10M IN A        210.206.69.11

What is TSIC invalid mean?
Sometimes it show "TSIG ok".
Could you help me?






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