# Cannot receive data after using grok

**URL:** <https://discuss.elastic.co/t/cannot-receive-data-after-using-grok/110086>\
**Category:** Logstash\
**Created:** [December 4, 2017, 3:48am UTC](https://discuss.elastic.co/t/cannot-receive-data-after-using-grok/110086 "2017-12-04T03:48:30Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![peterch](https://avatars.discourse-cdn.com/v4/letter/p/e5b9ba/32.png) [@peterch](https://discuss.elastic.co/u/peterch)\
**Post date:** [December 4, 2017, 3:48am UTC](https://discuss.elastic.co/t/cannot-receive-data-after-using-grok/110086/1 "2017-12-04T03:48:30Z")

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Dear all,

The following is my logstash config. However, I find cannot receive data. I use netstat -an find the port of 5044 and 514 are not listening. If i remove grok, can receive data. Any idea? Thanks

input{  
beats {  
port =\> 5044  
tags =\> "winlog"  
}  
syslog{  
port =\> 514  
tags =\> "syslog"  
}  
}

filter{  
if "Imperva Inc" in [message]{  
grok { match =\> ["message" =\> "(cs1=)(?[^"]+) (cs1Label=)"]}  
}  
}

output {  
if "winlog" in [tags]{  
elasticsearch {  
hosts =\> ["localhost:9200"]  
sniffing =\> true  
manage\_template =\> false  
index =\> "%{[@metadata][beat]}-%{+YYYY.MM.dd}"  
document\_type =\> "%{[@metadata][type]}"  
}  
}  
else if "syslog" in [tags]{  
elasticsearch {  
hosts =\> ["localhost:9200"]  
sniffing =\> true  
manage\_template =\> false  
index =\> "syslog"  
}  
}

---

<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:** [December 4, 2017, 6:24am UTC](https://discuss.elastic.co/t/cannot-receive-data-after-using-grok/110086/2 "2017-12-04T06:24:31Z")

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Have you looked in the Logstash logs for clues?

---

<div class="post-metadata">

**Author:** ![peterch](https://avatars.discourse-cdn.com/v4/letter/p/e5b9ba/32.png) [@peterch](https://discuss.elastic.co/u/peterch)\
**Post date:** [December 5, 2017, 1:57am UTC](https://discuss.elastic.co/t/cannot-receive-data-after-using-grok/110086/3 "2017-12-05T01:57:50Z")

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Hi Magnusbaeck,

Thanks for your reply, I find the problem. The reason is (cs1=)(?[^"]+) should be (cs1=)(?[^"]+)

Problem solved.

Thanks

---

<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:** [January 2, 2018, 1:57am UTC](https://discuss.elastic.co/t/cannot-receive-data-after-using-grok/110086/4 "2018-01-02T01:57:58Z")

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Closed on January 2, 2018, 1:57am UTC

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