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entry-title"> Fixed: ‘IO Error: ‘Network Adapter couldn’t establish the connection’</h1><div id="single-post-meta" class="post-meta clearfix"><span class="author-meta single-author no-avatars"><span class="meta-item meta-author-wrapper meta-author-1"><span class="meta-author"><style>.no-icon:before{;}</style><a href="/author/admin/" class="author-name tie-icon no-icon" title="Kevin Arrows"><label style="color:gray"> By </label>Kevin Arrows</a></span></span></span><span class="date meta-item tie-icon">March 20, 2023</span><div class="tie-alignright"><span class="meta-reading-time meta-item"><span class="tie-icon-bookmark" aria-hidden="true"/> 2 minutes read</span></div><div>Kevin is a <a href="/about/#:~:text=Kevin%20Arrows" style="text-decoration: underline;">certified</a> Network Engineer</div></div></div></header></div></div><div class="container fullwidth-featured-area-wrapper"/><div id="content" class="site-content container"><div id="main-content-row" class="tie-row main-content-row"><div class="main-content tie-col-md-8 tie-col-xs-12" role="main"><article id="the-post" class="container-wrapper post-content tie-standard"><div class="entry-content entry clearfix"><p>Oracle SQL is an Integrated Development Environment that was created for working on Oracle Databases with SQL. This product is developed and provided by Oracle corporation for free and it is based on the Java Development Kit. Quite recently, there have been many reports of an “<strong>IO Error: The Network Adapter Could Not Establish The Connection</strong>” Error while testing a database connection.</p><figure id="attachment_130435" aria-describedby="caption-attachment-130435" style="width: 1073px" class="wp-caption aligncenter"><img decoding="async" class="size-full wp-image-130435" src="https://cdn.appuals.com/wp-content/uploads/2019/08/2019-08-10_182151.png" alt="" width="1073" height="612"/><figcaption id="caption-attachment-130435" class="wp-caption-text">IO ERROR: The network adapter could not establish the connection</figcaption></figure><div id="what-causes-the-the-network-adapter-could-not-establish-the-connection-error" class="index-title"/><h3>What Causes the “The Network Adapter Could Not Establish The Connection” Error?</h3><p>After receiving numerous reports from multiple users, we decided to investigate the issue and devised a set of solutions to fix it completely. Also, we looked into the reasons due to which this error is triggered and listed them as follows.</p><div class="plus tie-list-shortcode"><ul><li><strong>Incorrect Details: </strong>Make sure that the connection details have been entered properly. The Hostname, Port, Username, and password need to be entered correctly in order to establish the connection. If any of these values aren’t entered properly, the error might be triggered.</li><li><strong>Disabled Service: </strong>It is very important that the listener service has been started in the background for the application to work properly, If it hasn’t been started or is disabled, this error might be triggered.</li></ul></div><p>Now that you have a basic understanding of the nature of the problem, we will move on towards the solutions. Make sure to implement these in the specific way in which they are presented to avoid conflict.</p><div class="expu-d912d8b96c0cd37b3bf30f3697df1cc3 expu-protipmiddle_2" id="expu-d912d8b96c0cd37b3bf30f3697df1cc3"/><div id="solution-1-checking-details" class="index-title"/><h3>Solution 1: Checking Details</h3><p>It is important that the correct details have been entered for the connection. Sometimes, the details entered don’t match the server configurations and the error is triggered. Therefore, in this step, we will be checking and entering the details again. For that:</p><ol><li><strong>Download</strong> and install Notepad++ from<a href="//notepad-plus-plus.org/downloads/" target="_blank" rel="nofollow"> here</a>.</li><li>Navigate to the following address.<pre>DB Home: C:/app/Username/product/11.2.0(version might differ)/dbhome_1/Network/Admin</pre><figure id="attachment_130436" aria-describedby="caption-attachment-130436" style="width: 1109px" class="wp-caption aligncenter"><img decoding="async" loading="lazy" class="size-full wp-image-130436" src="https://cdn.appuals.com/wp-content/uploads/2019/08/2019-08-10_182243.png" alt="" width="1109" height="186"/><figcaption id="caption-attachment-130436" class="wp-caption-text">Navigating to the address</figcaption></figure></li><li>Right-click on the “<strong>tnsnames</strong>.<strong>ora</strong>” file and select “<strong>Open With Notepad ++</strong>” option.<figure id="attachment_130437" aria-describedby="caption-attachment-130437" style="width: 951px" class="wp-caption aligncenter"><img decoding="async" loading="lazy" class="size-full wp-image-130437" src="https://cdn.appuals.com/wp-content/uploads/2019/08/2019-08-10_182305.png" alt="" width="951" height="543"/><figcaption id="caption-attachment-130437" class="wp-caption-text">Right-clicking on the file and selecting “Open With Notepad++”</figcaption></figure></li><li>Under the “<strong>ORCL=</strong>” heading, note the “<strong>Port</strong>” and the “<strong>Host</strong>” details.</li><li>Also, note the “<strong>Service</strong> <strong>Name</strong>“.<figure id="attachment_130438" aria-describedby="caption-attachment-130438" style="width: 1152px" class="wp-caption aligncenter"><img decoding="async" loading="lazy" class="size-full wp-image-130438" src="https://cdn.appuals.com/wp-content/uploads/2019/08/2019-08-10_182326.png" alt="" width="1152" height="873"/><figcaption id="caption-attachment-130438" class="wp-caption-text">Noting down the details</figcaption></figure></li><li>Enter these details while establishing the network connection and click on “<strong>Test</strong>“.</li><li>Check to see if the issue is solved.</li></ol><div id="solution-2-starting-listener-service" class="index-title"/><h3>Solution 2: Starting Listener Service</h3><p>It is possible that the listener service hasn’t been started. This service is required by the application in order to establish a connection. Therefore, in this step, we will be starting the service by entering a command in the Command prompt. For that:</p><ol><li>Press “<strong>Windows</strong>” + “<strong>R</strong>” to open the Run prompt.</li><li>Type in “<strong>Cmd</strong>” and press “<strong>Shift</strong>” + “<strong>Ctrl</strong>” + “<strong>Enter</strong>” to provide adminsitrative privileges.<figure id="attachment_116123" aria-describedby="caption-attachment-116123" style="width: 418px" class="wp-caption aligncenter"><img decoding="async" loading="lazy" class="size-full wp-image-116123" src="https://cdn.appuals.com/wp-content/uploads/2019/05/2019-05-31_150859.png" alt="" width="418" height="226"/><figcaption id="caption-attachment-116123" class="wp-caption-text">Typing cmd in the Run Prompt and pressing “Shift”+ “Ctrl” + “Enter”</figcaption></figure></li><li>Type in the following command to check if the service is started.<pre>lsnrctl status</pre></li><li>If the result is similar to the image below, it means that the service <strong>hasn’t</strong> been started.<figure id="attachment_130439" aria-describedby="caption-attachment-130439" style="width: 968px" class="wp-caption aligncenter"><img decoding="async" loading="lazy" class="size-full wp-image-130439" src="https://cdn.appuals.com/wp-content/uploads/2019/08/2019-08-10_182404.png" alt="" width="968" height="525"/><figcaption id="caption-attachment-130439" class="wp-caption-text">This message is displayed if the service hasn’t been started</figcaption></figure></li><li><strong>Enter</strong> the following command to start the service manually.<pre>lsnrctl start</pre><figure id="attachment_130440" aria-describedby="caption-attachment-130440" style="width: 922px" class="wp-caption aligncenter"><img decoding="async" loading="lazy" class="size-full wp-image-130440" src="https://cdn.appuals.com/wp-content/uploads/2019/08/2019-08-10_182421.png" alt="" width="922" height="212"/><figcaption id="caption-attachment-130440" class="wp-caption-text">Typing in the command to start the service</figcaption></figure></li><li>Now that the listener service has been started, <strong>open</strong> the application and <strong>check</strong> to see if a new connection can be established.</li></ol><div class="9bee406ab2d28ba12d1f54ec6777d022" data-index="3" style="float: none; margin:0px;"><div class="expu-dfcd1f3780e22f790a06f8358f6ef5e7 expu-protipeop" id="expu-dfcd1f3780e22f790a06f8358f6ef5e7"/><div class="crp_related crp-text-only"><br/><p><b>Read Next</b></p><p/><ul><li><a href="/fix-windows-couldnt-automatically-bind-the-ip-protocol-stack-to-the-network-adapter/" class="crp_link post-84431"><span class="crp_title">Fix: Windows couldn't automatically bind the IP protocol stack to the network…</span></a></li><li><a href="/tarkov-error-106015/" class="crp_link post-298380"><span class="crp_title">Fix: Tarkov Error 106015 'Cannot establish server connection'</span></a></li><li><a href="/new-world-connection-error/" class="crp_link post-242256"><span class="crp_title">Fix: "Unable to establish connection with the server" on 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