# Logstash websocket input plugin throwing NoMethodError exception **URL:** \ **Category:** Logstash\ **Created:** [June 15, 2020, 7:32am UTC](https://discuss.elastic.co/t/logstash-websocket-input-plugin-throwing-nomethoderror-exception/237081 "2020-06-15T07:32:26Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![AlessandroKP](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alessandrokp/32/45312_2.png) [@AlessandroKP](https://discuss.elastic.co/u/AlessandroKP)\ **Post date:** [June 15, 2020, 7:32am UTC](https://discuss.elastic.co/t/logstash-websocket-input-plugin-throwing-nomethoderror-exception/237081/1 "2020-06-15T07:32:26Z")
Hi all, I am having some troubles using the Logstash websocket input plugin. I need Logstash to read a stream of events from a websocket endpoint and thus I am trying the following pipeline configuration ```auto input { websocket { url => "wss://my/url?key=mykey" mode => "client" } } filter { } output { stdout { codec => "rubydebug" } } ``` The pipeline is starting without any error, however I am not getting any output on console. Instead I get the following log message > [WARN][logstash.inputs.websocket][test-websocket] websocket input client threw exception, restarting {: **exception=\>#\** } repeated every few seconds. I am currently using **Logstash 7.7.0**. What could be the cause of this exception? I am sure that the websocket is streaming data because I can connect to it with a command-line client and I can receive the events through it, but it looks like Logstash has a problem connecting to the endpoint or it is not able to process the events. Anyone had the same problem? ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [June 15, 2020, 12:40pm UTC](https://discuss.elastic.co/t/logstash-websocket-input-plugin-throwing-nomethoderror-exception/237081/2 "2020-06-15T12:40:42Z")
Possibly [this](https://github.com/logstash-plugins/logstash-input-websocket/issues/3) issue? ---
**Author:** ![AlessandroKP](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alessandrokp/32/45312_2.png) [@AlessandroKP](https://discuss.elastic.co/u/AlessandroKP)\ **Post date:** [June 16, 2020, 7:52am UTC](https://discuss.elastic.co/t/logstash-websocket-input-plugin-throwing-nomethoderror-exception/237081/3 "2020-06-16T07:52:12Z")
Hi @Badger, thanks for the reply. I followed the suggestion contained in this [**issue**](https://github.com/logstash-plugins/logstash-input-websocket/issues/3), by putting a trailing slash to the URL in the websocket input parameter **url** , i.e. ```auto input { websocket { url => "wss://?key=/" mode => "client" } } filter { } output { stdout { codec => "rubydebug" } } ``` but now I get the following error: ``` warning: thread "Api Webserver" terminated with exception (report_on_exception is true): Errno::EADDRNOTAVAIL: Cannot assign requested address - bind - Cannot assign requested address initialize at org/jruby/ext/socket/RubyTCPServer.java:127 new at org/jruby/RubyIO.java:876 add_tcp_listener at /app/logstash-7.7.1/vendor/bundle/jruby/2.5.0/gems/puma-4.3.5-java/lib/puma/binder.rb:229 add_tcp_listener at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/forwardable.rb:229 start_webserver at /app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:104 run at /app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:60 each at org/jruby/RubyRange.java:526 each_with_index at org/jruby/RubyEnumerable.java:1258 run at /app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:55 start_webserver at /app/logstash-7.7.1/logstash-core/lib/logstash/agent.rb:393 [2020-06-16T09:45:30,979][FATAL][logstash.runner] An unexpected error occurred! {:error=>#, :backtrace=>["org/jruby/ext/socket/RubyTCPServer.java:127:in `initialize'", "org/jruby/RubyIO.java:876:in `new'", "/app/logstash-7.7.1/vendor/bundle/jruby/2.5.0/gems/puma-4.3.5-java/lib/puma/binder.rb:229:in `add_tcp_listener'", "/app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:104:in `start_webserver'", "/app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:60:in `block in run'", "org/jruby/RubyRange.java:526:in `each'", "org/jruby/RubyEnumerable.java:1258:in `each_with_index'", "/app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:55:in `run'", "/app/logstash-7.7.1/logstash-core/lib/logstash/agent.rb:393:in `block in start_webserver'"]} [...][ERROR][org.logstash.Logstash] java.lang.IllegalStateException: Logstash stopped processing because of an error: (SystemExit) exit ``` and Logstash just stops. ---
**Author:** ![AlessandroKP](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alessandrokp/32/45312_2.png) [@AlessandroKP](https://discuss.elastic.co/u/AlessandroKP)\ **Post date:** [June 29, 2020, 10:02am UTC](https://discuss.elastic.co/t/logstash-websocket-input-plugin-throwing-nomethoderror-exception/237081/4 "2020-06-29T10:02:48Z")
Hi all, I got some updates on the issue. By looking on the Internet, it seems that the problem might be caused by **some other client listening on the default port for WSS connection** , hence the error message "Errno::EADDRNOTAVAIL: Cannot assign requested address". By checking with netstat it looks like there are no connections on ports 80 and 443. So, I tried the following things: - start logstash with root privileges - replace **wss** protocol with **ws** in the URL of the websocket endpoint: ```auto input { websocket { url => "ws://?key=/" mode => "client" } } filter { } output { stdout { codec => "rubydebug" } } ``` In both cases, I get the same error message as in my last post: ``` warning: thread "Api Webserver" terminated with exception (report_on_exception is true): Errno::EADDRNOTAVAIL: Cannot assign requested address - bind - Cannot assign requested address initialize at org/jruby/ext/socket/RubyTCPServer.java:127 new at org/jruby/RubyIO.java:876 add_tcp_listener at /app/logstash-7.7.1/vendor/bundle/jruby/2.5.0/gems/puma-4.3.5-java/lib/puma/binder.rb:229 add_tcp_listener at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/forwardable.rb:229 start_webserver at /app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:104 run at /app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:60 each at org/jruby/RubyRange.java:526 each_with_index at org/jruby/RubyEnumerable.java:1258 run at /app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:55 start_webserver at /app/logstash-7.7.1/logstash-core/lib/logstash/agent.rb:393 [...][FATAL][logstash.runner] An unexpected error occurred! {:error=>#, :backtrace=>["org/jruby/ext/socket/RubyTCPServer.java:127:in `initialize'", "org/jruby/RubyIO.java:876:in `new'", "/app/logstash-7.7.1/vendor/bundle/jruby/2.5.0/gems/puma-4.3.5-java/lib/puma/binder.rb:229:in `add_tcp_listener'", "/app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:104:in `start_webserver'", "/app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:60:in `block in run'", "org/jruby/RubyRange.java:526:in `each'", "org/jruby/RubyEnumerable.java:1258:in `each_with_index'", "/app/logstash-7.7.1/logstash-core/lib/logstash/webserver.rb:55:in `run'", "/app/logstash-7.7.1/logstash-core/lib/logstash/agent.rb:393:in `block in start_webserver'"]} [...][ERROR][org.logstash.Logstash] java.lang.IllegalStateException: Logstash stopped processing because of an error: (SystemExit) exit ``` I also tried starting Logstash with simple stdin input configuration to see if the problem is related to some general setting: `bin/logstash -e "input{stdin{}} output{stdout{codec=>rubydebug}}"` and Logstash is starting without any problems. Maybe the logstash settings file **logstash.yml** could be helpful information. Here it is: ``` node.name: logstash-${HOSTNAME} log.level: info http.host: "${HOSTNAME}" http.port: 9600 config.reload.automatic: true config.reload.interval: 3s ``` Any idea on what could be the cause of the error? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 27, 2020, 10:13am UTC](https://discuss.elastic.co/t/logstash-websocket-input-plugin-throwing-nomethoderror-exception/237081/5 "2020-07-27T10:13:22Z")
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