{"id":745,"date":"2019-05-03T14:38:26","date_gmt":"2019-05-03T05:38:26","guid":{"rendered":"https:\/\/itips.krsw.biz\/?p=745"},"modified":"2025-06-09T22:16:20","modified_gmt":"2025-06-09T13:16:20","slug":"linux-ssh-connection-refused","status":"publish","type":"post","link":"https:\/\/itips.krsw.biz\/en\/linux-ssh-connection-refused\/","title":{"rendered":"What you should check when SSH connection is refused in Linux"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/05\/linux_1556805645-661x800.png\" alt=\"What you should check when SSH connection is refused in Linux\" width=\"450\" class=\"alignnone size-large wp-image-738\" srcset=\"https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/05\/linux_1556805645-661x800.png 661w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/05\/linux_1556805645-529x640.png 529w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/05\/linux_1556805645-264x320.png 264w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/05\/linux_1556805645-768x930.png 768w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/05\/linux_1556805645-248x300.png 248w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/05\/linux_1556805645.png 1057w\" sizes=\"(max-width: 661px) 100vw, 661px\" \/><\/p>\n<p>What you should check when SSH connection is refused in Linux ?<\/p>\n<p>In initial settings of Linux server like CentOS or Ubuntu, sometimes you fail SSH connection.<br \/>\nThis article shows what you should check when SSH connection is refused in Linux.<\/p>\n<p><!--more--><\/p>\n<p><\/br><\/p>\n<h2>SSH connection is refused<\/h2>\n<p>When you try to connect to Linux by SSH application like <a href=\"https:\/\/forest.watch.impress.co.jp\/library\/software\/utf8teraterm\/\">Tera Term<\/a>, you would see &quot;connection refused&quot;.<\/p>\n<p><\/br><\/p>\n<h2>What you should check<\/h2>\n<ul>\n<li>Server side\n<ul>\n<li>SSH service software<\/li>\n<li>Service is working or not<\/li>\n<li>Server IP is known in the network or not<\/li>\n<li>Accsess from outside is allowed or not<\/li>\n<li>FW allows access or not<\/li>\n<\/ul>\n<\/li>\n<li>Client side\n<ul>\n<li>Network path from client to server<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><\/br><\/p>\n<h3>SSH service software<\/h3>\n<p>There is a software <code>openssh-server<\/code> , you can install it by <code>apt-get install<\/code> .<\/p>\n<pre><code>$ sudo apt-get install openssh-server<\/code><\/pre>\n<p><a href=\"https:\/\/qiita.com\/a_k0406\/items\/660e686285ead5ac93f4\">ssh connection to ubuntu - Qiita<\/a><\/p>\n<blockquote>\n<p>After installation, you can execute below.<br \/>\n$ ssh -V<br \/>\nThen you can see the result. So installation is done correctly.<br \/>\nOpenSSH_6.6.1p1 Ubuntu-2ubuntu2.6, OpenSSL 1.0.1f6 Jan 2014<br \/>\n<a href=\"http:\/\/www.widesnow.com\/entry\/2016\/04\/28\/071621\">Activate SSH on Ubuntu 14.04 - wide_snow\u2019s blog<\/a><\/p>\n<\/blockquote>\n<p><\/br><\/p>\n<h3>Service is working or not<\/h3>\n<p>In order to check <code>openssh-server<\/code> is working or not, You can try SSH connection from the server to the server itself.<br \/>\nIf you could login, <code>openssh-server<\/code> is working.<\/p>\n<pre><code>$ ssh (IP address of server)<\/code><\/pre>\n<p><\/br><\/p>\n<h3>Server IP is known in the network or not<\/h3>\n<p>You can check IP address of server by <code>ifconfig<\/code> command.<br \/>\nYou can use <code>ip a<\/code> command too.<\/p>\n<p>But <code>ifconfig<\/code> command can't prove that IP is known in the network or not.<br \/>\nIf other machine uses same IP address, IP address conflict happens on network.<\/p>\n<p>Then you can use <code>nmap<\/code> command and check MAC address of IP that network(LAN) knows.<br \/>\nFirst you can activate <code>nmap<\/code> by <code>apt install<\/code> .<\/p>\n<pre><code>$ sudo apt install nmap<\/code><\/pre>\n<p>Then you check MAC address of IP on network.<br \/>\nIn below case, network is 192.168.0.xxx.<\/p>\n<pre><code>$ sudo nmap 192.168.0.0\/24 -sP<\/code><\/pre>\n<p>If MAC address that <code>nmap<\/code> shows is not same as the MAC address that you checked by <code>ifconfig<\/code>, it means that there is IP address conflict.<\/p>\n<p><a href=\"https:\/\/toxweblog.toxbe.com\/2018\/03\/08\/ssh-port-connection-refused\/\">Port Connection refused in case of SSH connection | TOMMY NOTES<\/a><br \/>\n<a href=\"http:\/\/www.searchman.info\/tips\/1050.html\">Install nmap<\/a><\/p>\n<p><\/br><\/p>\n<h3>Accsess from outside is allowed or not<\/h3>\n<p>You can check access denied list in <code>\/etc\/hosts.deny<\/code>.<br \/>\nIf client access is denied in the list, you can comment or delete it.<\/p>\n<pre><code>$ sudo nano \/etc\/hosts.deny\n$ sudo reboot<\/code><\/pre>\n<p><a href=\"https:\/\/www.turbolinux.co.jp\/products\/server\/11s\/user_guide\/tcpwrapperconf.html\">settings (\/etc\/hosts.allow\u3001\/etc\/hosts.deny)<\/a><br \/>\n<a href=\"https:\/\/teratail.com\/questions\/99681\">How to apply hosts.allow hosts.deny | teratail<\/a><br \/>\n<a href=\"https:\/\/renoji.com\/IT.php?Contents=OS_CentOS\/Setting_hosts.html\">Access control by hosts file - renoji.com<\/a><\/p>\n<p><\/br><\/p>\n<h3>FW allows access or not<\/h3>\n<p>You can check FW allows access or not by <code>ufw status<\/code> command.<\/p>\n<pre><code>$ sudo ufw status<\/code><\/pre>\n<p>If port 22 is not allowed, you can allow it.<\/p>\n<pre><code>$ sudo ufw allow ssh<\/code><\/pre>\n<p><a href=\"https:\/\/qiita.com\/toujika\/items\/be21d361cf80d664859c\">How to open port in Ubuntu - Qiita<\/a><\/p>\n<p><\/br><\/p>\n<h3>Network path from client to server<\/h3>\n<p>With using <code>ping<\/code> command, you can check that network path runs from client to server.<br \/>\nIf response comes, network path is OK.<\/p>\n<pre><code>$ ping (IP address of server)<\/code><\/pre>\n<p><\/br><\/p>\n<h2>Finally<\/h2>\n<ul>\n<li>If SSH connection is refused, check SSH software, network path, IP address conflict.<\/li>\n<\/ul>\n<p><\/br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What you should check when SSH connection is refused in Linux ? In initial settings of Linux server  &#8230; <\/p>\n","protected":false},"author":1,"featured_media":738,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"en_US","_original_post":"737","footnotes":""},"categories":[5,98],"tags":[75],"class_list":["post-745","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software","category-network","tag-linux","en-US"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What you should check when SSH connection is refused in Linux - ITips\u30b7\u30b9\u30c6\u30e0\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u30ba<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itips.krsw.biz\/en\/linux-ssh-connection-refused\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What you should check when SSH connection is refused in Linux - ITips\u30b7\u30b9\u30c6\u30e0\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u30ba\" \/>\n<meta property=\"og:description\" content=\"What you should check when SSH connection is refused in Linux ? 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