# Gelf cannot parse

**URL:** <https://discuss.elastic.co/t/gelf-cannot-parse/159732>\
**Category:** Logstash\
**Created:** [December 6, 2018, 1:12pm UTC](https://discuss.elastic.co/t/gelf-cannot-parse/159732 "2018-12-06T13:12:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![nr2017](https://avatars.discourse-cdn.com/v4/letter/n/e79b87/32.png) [@nr2017](https://discuss.elastic.co/u/nr2017)\
**Post date:** [December 6, 2018, 1:12pm UTC](https://discuss.elastic.co/t/gelf-cannot-parse/159732/1 "2018-12-06T13:12:29Z")

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\<[2018-12-05T17:29:03,698][WARN][logstash.inputs.gelf] Gelfd failed to parse a message skipping {:exception=\>#\<Gelfd::UnknownHeaderError: Could not find parser for header: [123, 34]\>, :backtrace=\>["/opt/logstash/vendor/bundle/jruby/2.3.0/gems/gelfd-0.2.0/lib/gelfd/parser.rb:14:in `parse'", "/opt/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-input-gelf-3.1.1/lib/logstash/inputs/gelf.rb:212:in`udp\_listener'", "/opt/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-input-gelf-3.1.1/lib/logstash/inputs/gelf.rb:93:in `block in run'"]}\>  
Im getting this error. can someone help

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<div class="post-metadata">

**Author:** ![nr2017](https://avatars.discourse-cdn.com/v4/letter/n/e79b87/32.png) [@nr2017](https://discuss.elastic.co/u/nr2017)\
**Post date:** [December 6, 2018, 1:13pm UTC](https://discuss.elastic.co/t/gelf-cannot-parse/159732/2 "2018-12-06T13:13:22Z")

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Logstash input is configured to listen on UDP 12201

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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:** [January 3, 2019, 1:13pm UTC](https://discuss.elastic.co/t/gelf-cannot-parse/159732/3 "2019-01-03T13:13:23Z")

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