# Netflow from Watchguard

**URL:** <https://discuss.elastic.co/t/netflow-from-watchguard/204109>\
**Category:** Logstash\
**Created:** [October 17, 2019, 5:44pm UTC](https://discuss.elastic.co/t/netflow-from-watchguard/204109 "2019-10-17T17:44:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Vladx](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vladx/32/48089_2.png) [@Vladx](https://discuss.elastic.co/u/Vladx)\
**Post date:** [October 17, 2019, 5:44pm UTC](https://discuss.elastic.co/t/netflow-from-watchguard/204109/1 "2019-10-17T17:44:32Z")

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Hi,

I'm trying to use logstash as netflow collector to forward netflow to Qradar. It is pretty straightforward and I think my config is ok

> #this is for netflow  
> udp {  
> port =\> 2081  
> type =\> netflow  
> codec =\> netflow {  
> versions =\> [9]  
> }  
> receive\_buffer\_bytes =\> 16777216  
> workers =\> 16  
> queue\_size =\> 32000  
> }  
> }

The flow source is Watchguard firewall and it is sending v9 netflow

As soon as Logstash receives the first flow, I'm getting bunch of error messages like this

> Oct 17 19:31:44 siem-proxy logstash[38697]: [2019-10-17T19:31:44,064][WARN][logstash.codecs.netflow] Can't (yet) decode flowset id 260 from source id 0, because no template to decode it with has be

Then, Logstash crashes like this

> Oct 17 19:33:09 siem-proxy logstash[38697]: warning: thread "[main]\>worker1" terminated with exception (report\_on\_exception is true):  
> Oct 17 19:33:09 siem-proxy logstash[38697]: java.lang.StackOverflowError  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:1038)  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at java.lang.ClassLoader.loadClass(ClassLoader.java:406)  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at java.lang.ClassLoader.loadClass(ClassLoader.java:411)  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at usr.share.logstash.logstash\_minus\_core.lib.logstash.codecs.base.RUBY$method$multi\_encode$0(/usr/share/logstash/logstash-core/lib/logstash/codecs/  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at usr.share.logstash.logstash\_minus\_core.lib.logstash.codecs.base.RUBY$method$encode$0(/usr/share/logstash/logstash-core/lib/logstash/codecs/base.r  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at usr.share.logstash.logstash\_minus\_core.lib.logstash.codecs.base.RUBY$block$multi\_encode$2(/usr/share/logstash/logstash-core/lib/logstash/codecs/b  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at org.jruby.runtime.CompiledIRBlockBody.yieldDirect(CompiledIRBlockBody.java:146)  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at org.jruby.runtime.BlockBody.yield(BlockBody.java:114)  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at org.jruby.runtime.Block.yield(Block.java:165)  
> Oct 17 19:33:09 siem-proxy logstash[38697]: at org.jruby.RubyArray.each(RubyArray.java:1792)

Any idea what's wrong here? Is there anyone here already collecting v9 netflow from Watchguard

Thank you  
Laszlo

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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:** [November 14, 2019, 5:44pm UTC](https://discuss.elastic.co/t/netflow-from-watchguard/204109/2 "2019-11-14T17:44:42Z")

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