{"id":6734,"date":"2022-05-09T06:01:39","date_gmt":"2022-05-09T00:31:39","guid":{"rendered":"https:\/\/pheonixsolutions.com\/blog\/?p=6734"},"modified":"2022-05-09T06:17:33","modified_gmt":"2022-05-09T00:47:33","slug":"nagios-alert-no-output-on-stdout-stderr-connect-to-address-ip-port-5666-connection-refused-on-ubuntu-18-04","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/nagios-alert-no-output-on-stdout-stderr-connect-to-address-ip-port-5666-connection-refused-on-ubuntu-18-04\/","title":{"rendered":"Nagios Alert: (No output on stdout) stderr: connect to address IP port 5666: Connection refused on Ubuntu 18.04"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">In this article we are going to resolve the Nagios alert \u201c(No output on stdout) stderr: connect to address IP port 5666: Connection refused\u201d on ubuntu 18.04<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Prerequisites<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A system running Ubuntu 18.04 should have the following<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>A user account with sudo privileges<\/li><li>The System with ufw&nbsp;<\/li><li>The system with nrpe configuration<\/li><\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Implementation:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 1:<\/strong> SSH the server<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$ ssh user@ip<br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 2: <\/strong>Check the ufw status<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$ ufw status&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(i) If it is inactive, enable ufw as shown below<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$ ufw enable<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/xLs1CMnjDSrQg4lCUE6JlJwCAnMl6qu3CbLigOv1xT4X1dAmzTFXaUByzmIgBDaYUJcgaI9QFO5dE7sb8WRm0QI5qICyW85aW5MYJGJun_Iwf7Sk7fofNoIQKld7deLIcNMvB092t5759sf1bQ\" alt=\"\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">(ii) If it is active as mentioned below proceed to the next step<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh3.googleusercontent.com\/agpvB2ST3lBrByqsB4P2-8xdA8lKzrVYHdQa3qCiRrn4ThchS6PibaKWJ-kvQVfvOpCTx4VaOkDNg6etDG7r6hGpWnPkQLgxg38ezDhbbZ8QsJsRqtN12MqIM29fEQtMwRnegByu-0MAoFwXvg\" alt=\"\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 3: <\/strong>Allow port number 5666 in the server&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$ ufw allow 5666<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/v-tAntAhFKfl66pQafUWlmk_aR0vydhbT_J3ZnevOAp6pdLOJKauXvnQmteJzK5YWH2JmbB-gkeWV6Myir31MoewSJmOORKo1yQbOOZlsVdzGU4dWUcrp2wgYHqXLhXFwMw78Oj9h-En1y5lbw\" alt=\"\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 4:<\/strong> Enable the nrpe module and start it&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$ sudo systemctl enable nrpe.service<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$ sudo systemctl start nrpe.service<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article we are going to resolve the Nagios alert \u201c(No output on stdout) stderr: connect to address IP [&hellip;]<\/p>\n","protected":false},"author":495,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1019],"tags":[948,947,274],"class_list":["post-6734","post","type-post","status-publish","format-standard","hentry","category-cloud-aws","tag-no-output-on-stdout","tag-port-5666","tag-ubuntu","psol-cat-cloud-aws"],"jetpack_publicize_connections":[],"jetpack_shortlink":"https:\/\/wp.me\/phn2x7-1KC","jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/pheonixsolutions.com\/blog\/wp-json\/wp\/v2\/posts\/6734","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pheonixsolutions.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pheonixsolutions.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pheonixsolutions.com\/blog\/wp-json\/wp\/v2\/users\/495"}],"replies":[{"embeddable":true,"href":"https:\/\/pheonixsolutions.com\/blog\/wp-json\/wp\/v2\/comments?post=6734"}],"version-history":[{"count":0,"href":"https:\/\/pheonixsolutions.com\/blog\/wp-json\/wp\/v2\/posts\/6734\/revisions"}],"wp:attachment":[{"href":"https:\/\/pheonixsolutions.com\/blog\/wp-json\/wp\/v2\/media?parent=6734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pheonixsolutions.com\/blog\/wp-json\/wp\/v2\/categories?post=6734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pheonixsolutions.com\/blog\/wp-json\/wp\/v2\/tags?post=6734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}