# SNMP Trap listener died?

**URL:** <https://discuss.elastic.co/t/snmp-trap-listener-died/47245>\
**Category:** Logstash\
**Created:** [April 13, 2016, 12:16pm UTC](https://discuss.elastic.co/t/snmp-trap-listener-died/47245 "2016-04-13T12:16:24Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![stefansaye](https://avatars.discourse-cdn.com/v4/letter/s/df788c/32.png) [@stefansaye](https://discuss.elastic.co/u/stefansaye)\
**Post date:** [April 13, 2016, 12:16pm UTC](https://discuss.elastic.co/t/snmp-trap-listener-died/47245/1 "2016-04-13T12:16:24Z")

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Dear logstash,

when i start logstash ,I got the error msg as follow,

```
/opt/logstash/bin/logstash -f /etc/logstash/conf.d/logstash-snmptrap.conf -d

```

> SNMP Trap listener died {:exception=\>#\<Psych::SyntaxError: (): mapping values are not allowed here at line 7 column 19\>, :backtrace=\>["org/jruby/ext/psych/PsychParser.java:228:in `parse'", "/opt/logstash/vendor/jruby/lib/ruby/1.9/psych.rb:375:in `parse\_stream'", "/opt/logstash/vendor/jruby/lib/ruby/1.9/psych.rb:323:in `parse'", "/opt/logstash/vendor/jruby/lib/ruby/1.9/psych.rb:250:in `load'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/snmp-1.2.0/lib/snmp/mib.rb:164:in `load_module'", "org/jruby/RubyIO.java:1183:in `open'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/snmp-1.2.0/lib/snmp/mib.rb:163:in `load_module'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/snmp-1.2.0/lib/snmp/manager.rb:699:in `load\_modules'", "org/jruby/RubyArray.java:1613:in `each'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/snmp-1.2.0/lib/snmp/manager.rb:699:in `load\_modules'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/snmp-1.2.0/lib/snmp/manager.rb:622:in `initialize'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-snmptrap-2.0.2/lib/logstash/inputs/snmptrap.rb:74:in `build\_trap\_listener'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-snmptrap-2.0.2/lib/logstash/inputs/snmptrap.rb:78:in `snmptrap_listener'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-snmptrap-2.0.2/lib/logstash/inputs/snmptrap.rb:53:in `run'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.1.3-java/lib/logstash/pipeline.rb:206:in `inputworker'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.1.3-java/lib/logstash/pipeline.rb:199:in `start\_input'"], :level=\>:warn}

---

<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:** [April 18, 2016, 9:05pm UTC](https://discuss.elastic.co/t/snmp-trap-listener-died/47245/2 "2016-04-18T21:05:31Z")

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What's your configuration? Are you setting the `yamlmibdir` option? The error message certainly suggests that there's something wrong with line 7 of some of the files in that directory.

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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:** [July 6, 2017, 5:01am UTC](https://discuss.elastic.co/t/snmp-trap-listener-died/47245/3 "2017-07-06T05:01:47Z")

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