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itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">故障代码651</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>故障代码651</h1></header>
<p><em>&quot;调制解调器(或其他连接设备)报告了一个错误。&quot;(The Modem (or other connecting device) has reported an error.)</em></p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="现象">现象<a href="#现象" class="hash-link" aria-label="Direct link to 现象" title="Direct link to 现象"></a></h2>
<p>联通宽带拨号失败,提示错误代码<code>651</code></p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="原因">原因<a href="#原因" class="hash-link" aria-label="Direct link to 原因" title="Direct link to 原因"></a></h2>
<ul>
<li>电脑软硬件配置错误</li>
<li>物理连接错误</li>
<li>联通多次宽带691/629认证失败导致短时间被拉黑</li>
<li>其他原因</li>
</ul>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="配置错误类解决方法">配置错误类解决方法<a href="#配置错误类解决方法" class="hash-link" aria-label="Direct link to 配置错误类解决方法" title="Direct link to 配置错误类解决方法"></a></h2>
<ol>
<li>确认网卡已启动,网卡驱动程序已安装正确</li>
<li>确认与网络相关的服务全部已启动</li>
<li>确认本地连接/以太网已启动</li>
<li>确认本地连接/以太网-属性-Internet协议版本4(TCP/IPv4)-属性,选中自动获取IP地址自动获得DNS服务器地址</li>
</ol>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="物理连接错误类解决方法">物理连接错误类解决方法<a href="#物理连接错误类解决方法" class="hash-link" aria-label="Direct link to 物理连接错误类解决方法" title="Direct link to 物理连接错误类解决方法"></a></h2>
<ol>
<li>用力插拔各个端口接口,以排除接触不良引发的物理连接错误</li>
<li>使用测线器测试墙上端口的信号状态,判断物理连接错误区域</li>
<li>使用测线器测试用户使用的网线的连通性</li>
<li>使用测线器测试小交换机/机房线架的信号输入的主线,确认主线信号源正常</li>
</ol>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="联通多次691629认证失败导致短时间拉黑">联通多次691/629认证失败导致短时间拉黑<a href="#联通多次691629认证失败导致短时间拉黑" class="hash-link" aria-label="Direct link to 联通多次691/629认证失败导致短时间拉黑" title="Direct link to 联通多次691/629认证失败导致短时间拉黑"></a></h2>
<p>联通运营商的宽带如果在多次认证失败以后使用该mac地址拨号会变成651错误静候3-5分钟解除也可以直接更改适配器的mac地址快速解决</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="宽带连接设置错误或冲突">宽带连接设置错误或冲突:<a href="#宽带连接设置错误或冲突" class="hash-link" aria-label="Direct link to 宽带连接设置错误或冲突:" title="Direct link to 宽带连接设置错误或冲突:"></a></h2>
<p>原因: 电脑中创建了多个宽带连接,且多个连接同时尝试拨号。</p>
<p>解决:删除所有宽带连接,然后重新创建一个新的宽带连接,并只使用这一个连接进行拨号。</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="其他原因类解决方法">其他原因类解决方法<a href="#其他原因类解决方法" class="hash-link" aria-label="Direct link to 其他原因类解决方法" title="Direct link to 其他原因类解决方法"></a></h2>
<ol>
<li><strong>重置TCP/IP协议栈</strong></li>
</ol>
<p>以管理员身份运行“命令提示符”或“PowerShell”,输入并运行以下命令:</p>
<div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">netsh winsock reset</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">netsh int ip reset</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
<p>执行完毕后,重启电脑。</p>
<ol start="2">
<li><strong>排除网络干扰</strong>:</li>
</ol>
<p>拨号时,尝试禁用电脑的无线网卡。</p>
<p>尝试禁用IPv6在宽带连接的属性中</p>
<p>尝试运行Windows的网络疑难解答。</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a href="https://github.com/ZSCNetSupportDept/website/tree/master/docs/wiki/08-故障/03-联通特定/651.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2025-10-20T17:21:43.000Z" itemprop="dateModified">Oct 20, 2025</time></b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/wiki/故障/联通特定/633"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">错误代码633</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/wiki/故障/联通特定/678"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">故障代码678</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#现象" class="table-of-contents__link toc-highlight">现象</a></li><li><a href="#原因" class="table-of-contents__link toc-highlight">原因</a></li><li><a href="#配置错误类解决方法" class="table-of-contents__link toc-highlight">配置错误类解决方法</a></li><li><a href="#物理连接错误类解决方法" class="table-of-contents__link toc-highlight">物理连接错误类解决方法</a></li><li><a href="#联通多次691629认证失败导致短时间拉黑" class="table-of-contents__link toc-highlight">联通多次691/629认证失败导致短时间拉黑</a></li><li><a href="#宽带连接设置错误或冲突" class="table-of-contents__link toc-highlight">宽带连接设置错误或冲突:</a></li><li><a href="#其他原因类解决方法" class="table-of-contents__link toc-highlight">其他原因类解决方法</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2025 ZSCNetworkSupport,Built with Docusaurus.</div></div></div></footer></div>
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