# ERROR pipeline/output.go:100 Failed to connect to backoff(async(tcp://0.0.0.0:5044)): dial tcp 0.0.0.0:5044: connect: connection refused **URL:** \ **Category:** Beats\ **Tags:** filebeat\ **Created:** [January 4, 2021, 6:56pm UTC](https://discuss.elastic.co/t/error-pipeline-output-go-100-failed-to-connect-to-backoff-async-tcp-0-0-0-0-5044-dial-tcp-0-0-0-0-connect-connection-refused/260121 "2021-01-04T18:56:55Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![UjjwalBera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ujjwalbera/32/81732_2.png) [@UjjwalBera](https://discuss.elastic.co/u/UjjwalBera)\ **Post date:** [January 4, 2021, 6:56pm UTC](https://discuss.elastic.co/t/error-pipeline-output-go-100-failed-to-connect-to-backoff-async-tcp-0-0-0-0-5044-dial-tcp-0-0-0-0-connect-connection-refused/260121/1 "2021-01-04T18:56:55Z")
Here below filebeat.yml output configuration ```auto output.logstash: enabled: true hosts: ["0.0.0.0:5044"] timeout: 86400`` ``` logstash.conf input configuration ```auto input { beats { port => 5044 host => "0.0.0.0" ssl => false } } ``` I am using filebeat-oss 6.8.9 and logtash-oss 6.8.9 ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [January 5, 2021, 12:36am UTC](https://discuss.elastic.co/t/error-pipeline-output-go-100-failed-to-connect-to-backoff-async-tcp-0-0-0-0-5044-dial-tcp-0-0-0-0-connect-connection-refused/260121/2 "2021-01-05T00:36:43Z")
Welcome to our community! 😃 What do your Logstash and Filebeat logs show? ---
**Author:** ![UjjwalBera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ujjwalbera/32/81732_2.png) [@UjjwalBera](https://discuss.elastic.co/u/UjjwalBera)\ **Post date:** [January 5, 2021, 7:16am UTC](https://discuss.elastic.co/t/error-pipeline-output-go-100-failed-to-connect-to-backoff-async-tcp-0-0-0-0-5044-dial-tcp-0-0-0-0-connect-connection-refused/260121/3 "2021-01-05T07:16:52Z")
> [@warkolm](#): > > Filebeat Filebeat logs showing ```auto |ERROR|pipeline/output.go:100|Failed to connect to backoff(async(tcp://logstash:5044)): lookup logstash on 127.0.0.11:53: no such host| |---|---|---| |ERROR|pipeline/output.go:100|Failed to connect to backoff(async(tcp://logstash:5044)): lookup logstash on 127.0.0.11:53: no such host| |ERROR|pipeline/output.go:100|Failed to connect to backoff(async(tcp://logstash:5044)): lookup logstash on 127.0.0.11:53: no such host| ``` Logstash logs showing ```auto [2021-01-04T21:13:31,431][INFO][logstash.setting.writabledirectory] Creating directory {:setting=>"path.queue", :path=>"/usr/share/logstash/data/queue"} [2021-01-04T21:13:31,463][INFO][logstash.setting.writabledirectory] Creating directory {:setting=>"path.dead_letter_queue", :path=>"/usr/share/logstash/data/dead_letter_queue"} [2021-01-04T21:13:32,283][INFO][logstash.runner] Starting Logstash {"logstash.version"=>"6.8.9"} [2021-01-04T21:13:32,354][INFO][logstash.agent] No persistent UUID file found. Generating new UUID {:uuid=>"1f05e506-3393-4869-811d-5e1f9f00f517", :path=>"/usr/share/logstash/data/uuid"} [2021-01-04T21:14:16,604][INFO][logstash.pipeline] Starting pipeline {:pipeline_id=>"main", "pipeline.workers"=>2, "pipeline.batch.size"=>125, "pipeline.batch.delay"=>50} [2021-01-04T21:15:04,181][INFO][logstash.inputs.beats] Beats inputs: Starting input listener {:address=>"logstash:5044"} [2021-01-04T21:15:04,221][INFO][logstash.pipeline] Pipeline started successfully {:pipeline_id=>"main", :thread=>"#"} [2021-01-04T21:15:04,419][INFO][logstash.agent] Pipelines running {:count=>1, :running_pipelines=>[:main], :non_running_pipelines=>[]} [2021-01-04T21:15:04,510][INFO][org.logstash.beats.Server] Starting server on port: 5044 [2021-01-04T21:15:05,196][INFO][logstash.agent] Successfully started Logstash API endpoint {:port=>9600} ``` ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [January 5, 2021, 7:18am UTC](https://discuss.elastic.co/t/error-pipeline-output-go-100-failed-to-connect-to-backoff-async-tcp-0-0-0-0-5044-dial-tcp-0-0-0-0-connect-connection-refused/260121/4 "2021-01-05T07:18:47Z")
Thanks. > [@UjjwalBera](#): > > ```auto > hosts: ["0.0.0.0:5044"] > > ``` That is not valid as an output. As you can see in the log the OS thinks you want to connect to localhost, and not the actual Logstash host. You will need to change the IP there to an IP that belongs to the Logstash host. ---
**Author:** ![UjjwalBera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ujjwalbera/32/81732_2.png) [@UjjwalBera](https://discuss.elastic.co/u/UjjwalBera)\ **Post date:** [January 5, 2021, 7:21am UTC](https://discuss.elastic.co/t/error-pipeline-output-go-100-failed-to-connect-to-backoff-async-tcp-0-0-0-0-5044-dial-tcp-0-0-0-0-connect-connection-refused/260121/5 "2021-01-05T07:21:34Z")
> [@warkolm](#): > > That is not valid as an output. As you can see in the log the OS thinks you want to connect to localhost, and not the actual Logstash host. You will need to change the IP there to an IP that belongs to the Logstash host. Sorry Later I have changed **0.0.0.0** to **logstash** that why now it is **logstash** Here is new filebeat logs with 0.0.0.0 host ```auto ERROR pipeline/output.go:100 Failed to connect to backoff(async(tcp://0.0.0.0:5044)): dial tcp 0.0.0.0:5044: connect: connection refused ERROR pipeline/output.go:100 Failed to connect to backoff(async(tcp://0.0.0.0:5044)): dial tcp 0.0.0.0:5044: connect: connection refused ``` Logtash logs with 0.0.0.0 host ```auto Sending Logstash logs to /usr/share/logstash/logs which is now configured via log4j2.properties [2021-01-05T07:24:55,810][INFO][logstash.setting.writabledirectory] Creating directory {:setting=>"path.queue", :path=>"/usr/share/logstash/data/queue"} [2021-01-05T07:24:55,844][INFO][logstash.setting.writabledirectory] Creating directory {:setting=>"path.dead_letter_queue", :path=>"/usr/share/logstash/data/dead_letter_queue"} [2021-01-05T07:24:56,707][INFO][logstash.runner] Starting Logstash {"logstash.version"=>"6.8.9"} [2021-01-05T07:24:56,754][INFO][logstash.agent] No persistent UUID file found. Generating new UUID {:uuid=>"fa698f3d-11a6-4c08-a920-860e4873d1e5", :path=>"/usr/share/logstash/data/uuid"} [2021-01-05T07:25:39,563][INFO][logstash.pipeline] Starting pipeline {:pipeline_id=>"main", "pipeline.workers"=>2, "pipeline.batch.size"=>125, "pipeline.batch.delay"=>50} ``` ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [January 5, 2021, 7:22am UTC](https://discuss.elastic.co/t/error-pipeline-output-go-100-failed-to-connect-to-backoff-async-tcp-0-0-0-0-5044-dial-tcp-0-0-0-0-connect-connection-refused/260121/6 "2021-01-05T07:22:42Z")
Does `logstash` resolve to an actual IP though? ---
**Author:** ![UjjwalBera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ujjwalbera/32/81732_2.png) [@UjjwalBera](https://discuss.elastic.co/u/UjjwalBera)\ **Post date:** [January 5, 2021, 7:30am UTC](https://discuss.elastic.co/t/error-pipeline-output-go-100-failed-to-connect-to-backoff-async-tcp-0-0-0-0-5044-dial-tcp-0-0-0-0-connect-connection-refused/260121/7 "2021-01-05T07:30:11Z")
I have used 0.0.0.0 host. Logtash & filebeat is same server and different container ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [February 2, 2021, 9:30am UTC](https://discuss.elastic.co/t/error-pipeline-output-go-100-failed-to-connect-to-backoff-async-tcp-0-0-0-0-5044-dial-tcp-0-0-0-0-connect-connection-refused/260121/8 "2021-02-02T09:30:17Z")
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