{"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>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>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><strong>Step 1:<\/strong> SSH the server<\/p>\n\n\n\n<p>$ ssh user@ip<br><\/p>\n\n\n\n<p><strong>Step 2: <\/strong>Check the ufw status<\/p>\n\n\n\n<p>$ ufw status&nbsp;<\/p>\n\n\n\n<p>(i) If it is inactive, enable ufw as shown below<\/p>\n\n\n\n<p>$ 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>(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><strong>Step 3: <\/strong>Allow port number 5666 in the server&nbsp;<\/p>\n\n\n\n<p>$ 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><strong>Step 4:<\/strong> Enable the nrpe module and start it&nbsp;<\/p>\n\n\n\n<p>$ sudo systemctl enable nrpe.service<\/p>\n\n\n\n<p>$ 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 port 5666: Connection refused\u201d on ubuntu 18.04 Prerequisites A system running Ubuntu 18.04 should have the following A user account with sudo privileges The System with ufw&nbsp; The system with&hellip; <a href=\"https:\/\/pheonixsolutions.com\/blog\/nagios-alert-no-output-on-stdout-stderr-connect-to-address-ip-port-5666-connection-refused-on-ubuntu-18-04\/\" class=\"more-link read-more\" rel=\"bookmark\">Continue Reading <span class=\"screen-reader-text\">Nagios Alert: (No output on stdout) stderr: connect to address IP port 5666: Connection refused on Ubuntu 18.04<\/span><i class=\"fa fa-arrow-right\"><\/i><\/a><\/p>\n","protected":false},"author":495,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_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":""},"categories":[345],"tags":[948,947,274],"class_list":{"0":"post-6734","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-nagios","7":"tag-no-output-on-stdout","8":"tag-port-5666","9":"tag-ubuntu","10":"h-entry","12":"h-as-article"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pheonix Solutions - We Empower Your Business Growth<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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content=\"https:\/\/pheonixsolutions.com\/blog\/nagios-alert-no-output-on-stdout-stderr-connect-to-address-ip-port-5666-connection-refused-on-ubuntu-18-04\/\" \/>\n<meta property=\"og:site_name\" content=\"PHEONIXSOLUTIONS\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/PheonixSolutions-209942982759387\/\" \/>\n<meta property=\"article:published_time\" content=\"2022-05-09T00:31:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-05-09T00:47:33+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lh6.googleusercontent.com\/xLs1CMnjDSrQg4lCUE6JlJwCAnMl6qu3CbLigOv1xT4X1dAmzTFXaUByzmIgBDaYUJcgaI9QFO5dE7sb8WRm0QI5qICyW85aW5MYJGJun_Iwf7Sk7fofNoIQKld7deLIcNMvB092t5759sf1bQ\" \/>\n<meta name=\"author\" content=\"meenakshi k\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@pheonixsolution\" \/>\n<meta name=\"twitter:site\" content=\"@pheonixsolution\" \/>\n<meta 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