# IIS logs -Provided Grok expressions do not match field value

**URL:** <https://discuss.elastic.co/t/iis-logs-provided-grok-expressions-do-not-match-field-value/139341>\
**Category:** Beats\
**Tags:** filebeat\
**Created:** [July 10, 2018, 12:16pm UTC](https://discuss.elastic.co/t/iis-logs-provided-grok-expressions-do-not-match-field-value/139341 "2018-07-10T12:16:55Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![neo](https://avatars.discourse-cdn.com/v4/letter/n/9fc348/32.png) [@neo](https://discuss.elastic.co/u/neo)\
**Post date:** [July 10, 2018, 12:16pm UTC](https://discuss.elastic.co/t/iis-logs-provided-grok-expressions-do-not-match-field-value/139341/1 "2018-07-10T12:16:55Z")

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Hi,i make an module for my iis log,i use the default filebeat grok for IIS to parse the message, and I get an error like "Provided Grok expressions do not match field value:"

one example of my message log is

2018-07-10 11:47:26 100.111.16.33 GET /2code/handlers/IP-Block/waves/account/wlc-auth.ashx username=avir&pass=Avi12345 443 - 100.111.16.76 - 200 0 0 5599

how can i find whats the problem is, I tried to find  
The script inside the Beats repo which lets you test your pipeline .

of your support but I didn't find the path.  
Please assist

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**Author:** ![exekias](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/exekias/32/28718_2.png) [@exekias](https://discuss.elastic.co/u/exekias)\
**Post date:** [July 10, 2018, 11:58pm UTC](https://discuss.elastic.co/t/iis-logs-provided-grok-expressions-do-not-match-field-value/139341/2 "2018-07-10T23:58:52Z")

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Hi @neo,

I would recommend using the simulate API to test your custom pipeline, have a look to [https://www.elastic.co/guide/en/beats/devguide/current/filebeat-modules-devguide.html](https://www.elastic.co/guide/en/beats/devguide/current/filebeat-modules-devguide.html) for a full guide on how modules work.

Best regards

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**Author:** ![neo](https://avatars.discourse-cdn.com/v4/letter/n/9fc348/32.png) [@neo](https://discuss.elastic.co/u/neo)\
**Post date:** [July 11, 2018, 8:19am UTC](https://discuss.elastic.co/t/iis-logs-provided-grok-expressions-do-not-match-field-value/139341/3 "2018-07-11T08:19:04Z")

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Thanks, I found the problem, I needed to send all columns of log property.

then it work great !

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 8, 2018, 8:19am UTC](https://discuss.elastic.co/t/iis-logs-provided-grok-expressions-do-not-match-field-value/139341/4 "2018-08-08T08:19:13Z")

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