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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>
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