{"id":55807,"date":"2020-05-13T13:13:25","date_gmt":"2020-05-13T17:13:25","guid":{"rendered":"https:\/\/www.inmotionhosting.com\/support\/?p=55807"},"modified":"2022-03-01T16:31:20","modified_gmt":"2022-03-01T21:31:20","slug":"check-if-port-blocked-netcat-ncat","status":"publish","type":"post","link":"https:\/\/www.inmotionhosting.com\/support\/security\/check-if-port-blocked-netcat-ncat\/","title":{"rendered":"Check if a Port is Blocked with Netcat \/ Ncat"},"content":{"rendered":"<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"538\" src=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2020\/05\/netcat-ncat-port-blocked-1024x538.jpg\" alt=\"Check if a Port is Blocked with Netcat \/ Ncat\" class=\"wp-image-94586\" srcset=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2020\/05\/netcat-ncat-port-blocked-1024x538.jpg 1024w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2020\/05\/netcat-ncat-port-blocked-300x158.jpg 300w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2020\/05\/netcat-ncat-port-blocked-768x403.jpg 768w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2020\/05\/netcat-ncat-port-blocked.jpg 1200w\" sizes=\"auto, (min-width: 1360px) 876px, (min-width: 960px) calc(61.58vw + 51px), calc(100vw - 80px)\" \/><\/figure>\n\n\n\n<p>If you\u2019re unable to connect to FTP, MySQL, or another service on your server, the port could be blocked by a firewall at any points before the actual software:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Local workstation<\/li><li><a href=\"https:\/\/www.inmotionhosting.com\/support\/server\/ssh\/how-to-find-your-local-router-ip-address-in-the-terminal\/\">Local network router<\/a><\/li><li>Virtual private network (VPN) or proxy<\/li><li>DNS Resolver<\/li><li>Internet service provider (ISP) (e.g. Verizon)<\/li><li>Web application firewall (WAF) (e.g. Sucuri)<\/li><li>Content delivery network (CDN) (e.g. Cloudflare)<\/li><li>Web server<\/li><\/ul>\n\n\n\n<p>You can scan server firewall logs for your IP address to troubleshoot the issue. But an easy way to troubleshoot this is by checking if the port is blocked by the server or your network. There are many online tools available for port scanning your web server and local router, including CanYouSeeMe.org and MXtoolbox.com. But you must be careful with these third party tools as there\u2019s no way to know what they\u2019ll do with your activity afterwards.<\/p>\n\n\n\n<p>Instead, we\u2019ll show you how to do this yourself from the command-line interface (CLI).<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#install\">Install Netcat\/Ncat<\/a><\/li><li><a href=\"#scan\">Scan a Single Port with Netcat \/ Ncat<\/a><ul><li><a href=\"#netcat\">Netcat \/ Nc<\/a><\/li><\/ul><ul><li><a href=\"#ncat\">Ncat<\/a><\/li><\/ul><\/li><\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"install\">Install Netcat\/Ncat<\/h2>\n\n\n\n<p><strong>Linux and macOS<\/strong> users can quickly check if a port is open in the terminal with pre-installed <a rel=\"noreferrer noopener\" href=\"https:\/\/sourceforge.net\/projects\/nc110\/\" target=\"_blank\">Nc<\/a> (and Netcat on Linux).<\/p>\n\n\n\n<p><strong>Windows<\/strong> users will need to install Netcat\u2019s successor, <a rel=\"noreferrer noopener\" href=\"https:\/\/nmap.org\/ncat\/\" target=\"_blank\">Ncat<\/a>, made by the Nmap project. <\/p>\n\n\n\n<p class=\"alert alert-info\">Both are good for seeing if a specific port is open on a local network, VPN, or server. Most operating systems can install Ncat alongside <a href=\"https:\/\/www.inmotionhosting.com\/support\/server\/ssh\/port-scan-with-nmap\/\">Nmap<\/a> (best for scanning multiple ports) and it\u2019s GUI application Zenmap.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"scan\">Scan a Single Port with Netcat \/ Ncat<\/h2>\n\n\n\n<p>The basic command format is the program name, domain \/ server IP \/ server hostname (<a href=\"https:\/\/www.inmotionhosting.com\/support\/website\/using-your-temporary-url\/\">temporary URL<\/a> excluding the username), and port number.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">nc domain.com port<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">netcat domain.com port<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">ncat domain.com port<\/pre>\n\n\n\n<p>We recommend the following parameters when scanning with Netcat, Nc, or Ncat:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code>-z<\/code> \u2013 See if the port is open without sending data <\/li><li><code>-v<\/code> \u2013 Show verbose information <\/li><li><code>-w<\/code> \u2013 Set a timeout between the client and the target node, otherwise Netcat will continue trying until a connection is made or you manually close the attempt (<kbd>Ctrl<\/kbd> + <kbd>C<\/kbd>)<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"netcat\">Netcat \/ Nc<\/h3>\n\n\n\n<p>To attempt to connect to port 21 (FTP) on a domain but timeout after 15 seconds if there\u2019s no response:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">nc -vzw 15 domain.com 21<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">netcat -vzw 15 domain.com 21<\/pre>\n\n\n\n<p>If successful, you\u2019ll see:<\/p>\n\n\n\n<p><code>Connection to domain.com 21 port [tcp\/ftp] succeeded!<\/code><\/p>\n\n\n\n<p>If the port connection is blocked or rejected, you\u2019ll see:<\/p>\n\n\n\n<p><code>nc: connect to domain port 21 (tcp) failed: Connection refused<\/code><\/p>\n\n\n\n<p>If the remote node\u2019s firewall <em>drops<\/em> the connection request, it may timeout:<\/p>\n\n\n\n<p><code>nc: connect to domain.com port 21 (tcp) timed out: Operation now in progress<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"ncat\">Ncat<\/h3>\n\n\n\n<p>The format is the same with Ncat \u2013 \u201cncat,\u201d parameters, the domain \/ server IP \/ server hostname (excluding your username), and the port number.<\/p>\n\n\n\n<p>To check if port 22 (SSH) is open on a web server with it\u2019s IP address:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ncat -vz 1.2.3.4 22<\/pre>\n\n\n\n<p>Add <code>-w #<\/code> to specify a timeout (15 seconds in this example):<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ncat -vzw 15 1.2.3.4 22<\/pre>\n\n\n\n<p>If successful, you\u2019ll see:<\/p>\n\n\n\n<p><code>Ncat: Version 7.60 ( https:\/\/nmap.org\/ncat ) <br>Ncat: Connected to 1.2.3.4:21. <br>Ncat: 0 bytes sent, 0 bytes received in 0.04 seconds.<\/code><\/p>\n\n\n\n<p>If unsuccessful, you\u2019ll see:<\/p>\n\n\n\n<p><code>Ncat: Version 7.60 ( https:\/\/nmap.org\/ncat )<br>Ncat: Connection refused.<\/code><\/p>\n\n\n\n<p>Learn more about Nc or Ncat with the manual:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">man nc<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">man ncat<\/pre>\n\n\n\n<p>Let us know if you have any questions about Netcat or Ncat.<\/p>\n\n\n<div class=\"jumbotron\"><p>Experience full control over your server environment and deploy the best operating and management systems that fit your needs with our reliable <a href=\"https:\/\/www.inmotionhosting.com\/cloud-vps\">Cloud VPS Hosting<\/a>!<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>If you&#8217;re unable to connect to FTP, MySQL, or another service on your server, the port could be blocked by a firewall at any points before the actual software: Local workstation Local network router Virtual private network (VPN) or proxy DNS Resolver Internet service provider (ISP) (e.g. Verizon) Web application firewall (WAF) (e.g. Sucuri) Content<a class=\"moretag\" href=\"https:\/\/www.inmotionhosting.com\/support\/security\/check-if-port-blocked-netcat-ncat\/\"> Read More ><\/a><\/p>\n","protected":false},"author":57014,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4299],"tags":[],"class_list":["post-55807","post","type-post","status-publish","format-standard","hentry","category-security"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Check if a Port is Blocked with Netcat \/ Ncat | InMotion Hosting<\/title>\n<meta name=\"description\" content=\"If you can&#039;t connect to FTP, MySQL, or another service on your server, the port may be blocked. 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