dig does not warn about clock skew
If the clock on either the server or the client is out of sync, and tsig fails because of this, dig does not warn the user with a message. ISC's version of dig correctly warns the user about clock skew.
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If the clock on either the server or the client is out of sync, and tsig fails because of this, dig does not warn the user with a message. ISC's version of dig correctly warns the user about clock skew.