# Duplicate Field with grok parsing iis logs

**URL:** <https://discuss.elastic.co/t/duplicate-field-with-grok-parsing-iis-logs/60218>\
**Category:** Logstash\
**Created:** [September 10, 2016, 1:44pm UTC](https://discuss.elastic.co/t/duplicate-field-with-grok-parsing-iis-logs/60218 "2016-09-10T13:44:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![asafi31](https://avatars.discourse-cdn.com/v4/letter/a/b38774/32.png) [@asafi31](https://discuss.elastic.co/u/asafi31)\
**Post date:** [September 10, 2016, 1:44pm UTC](https://discuss.elastic.co/t/duplicate-field-with-grok-parsing-iis-logs/60218/1 "2016-09-10T13:44:55Z")

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hello all

i am mount my iis logs to ELK centos machine  
i am using logstash for parsing the iislogs

but when i looking iis logs in kibana i saw grok field as duplicate  
message is o.k

kindly your adive

thx  
asaf

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [September 11, 2016, 8:06pm UTC](https://discuss.elastic.co/t/duplicate-field-with-grok-parsing-iis-logs/60218/2 "2016-09-11T20:06:02Z")

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Please supply

- your configuration,
- an example of an input line that Logstash parses, and
- an example of an event with a duplicate field (no Kibana screenshot please).

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 4:39am UTC](https://discuss.elastic.co/t/duplicate-field-with-grok-parsing-iis-logs/60218/3 "2017-07-06T04:39:02Z")

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