[SQU] Strange warnings in cache.log (idnsCheckQueue)

Can anyone tell-me what is the meaning of this messages ???
Is the DNS server unresponsive ???

TIA

2001/01/04 09:17:19| idnsCheckQueue: ID 77a: giving up after 20 tries and
46.1 seconds
2001/01/04 09:19:24| idnsCheckQueue: ID 7f0: giving up after 20 tries and
5.5 seconds
2001/01/04 09:54:48| idnsCheckQueue: ID e63: giving up after 20 tries and
46.5 seconds
2001/01/04 11:07:26| idnsCheckQueue: ID 2a12: giving up after 20 tries and
20.3 seconds
2001/01/04 11:12:08| idnsCheckQueue: ID 2b2d: giving up after 20 tries and
45.6 seconds
2001/01/04 11:19:54| idnsCheckQueue: ID 2cf1: giving up after 20 tries and
41.8 seconds
2001/01/04 11:24:02| idnsCheckQueue: ID 2e15: giving up after 20 tries and
10.7 seconds
2001/01/04 11:32:56| idnsCheckQueue: ID 3091: giving up after 20 tries and
41.3 seconds

[]-------------------------------------------------------------[]
  Pedro Ribeiro
  Online: http://www.isel.ipl.pt/~pribeiro/
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               Personal: pribeiro@net.ipl.pt
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