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    Problem report 
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    Resolution: Fixed
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    Trivial 
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    None
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    None
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        Sprint 14, Sprint 15, Sprint 16
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        0.5
Must update parser of DNS similar as server, also it has bug which does not allow hostname such as "A.ROOT-SERVERS.NET"
See
class CDnsParser extends CParser
example patch attached, if needed also see, c function zbx_validate_hostname()