网站可以在三个级别被阻止：计算机级别(Computer level)、网络级别 (Network level )或ISP/Governmental level。一些DNS服务，例如Open DNS，也提供了为共享计算机的不同用户阻止某些类型的网站的选项。然后，除了Internet(Internet) 选项(Options)中内置的“受限网站”之外，还有一些软件可以帮助阻止网站。我们不会讨论如何阻止网站。相反，我们将专注于如何访问受网络管理员和ISP(ISPs)（互联网服务提供商(Internet Service Provider)）限制在您的工作站上的网站。
访问受限网站
这篇文章是我们关于网站无法打开时该怎么做(what to do when a website does not open)的另一篇文章的扩展。本文中可能会重复一些提示。因此，如果您发现无法打开或访问某些网站，您可能需要尝试以下几项操作。
网站宕机了吗？
由于某些中断，您可能无法访问特定网站。检查这些网站监视器。检查 -是一个网站向上或向下。(Is a website up or down.)(Is a website up or down.) 它会告诉您博客或网站是否正在运行、在线、上线、下线，或者对任何人或所有人都没有。
阅读(Read)：如何在 Windows 上的 Chrome、Edge、Firefox 中将网站列入黑名单或阻止网站。(blacklist or block websites in Chrome, Edge, Firefox)
(Access Blocked Websites Blocked)访问在计算机上被(Computer)阻止的网站
访问网站有不同的选项，它们取决于用于阻止该网站的模式。例如，Open DNS采用类别系统，如果您想进入您父母选择为您阻止的类别，它会提供通知。
HTTP 和 HTTPS
首先要尝试的是在网站URL前面的“HTTP”中添加或删除“s” 。例如，输入 https://www.facebook.com 可能会为您打开它，因为只有“http://www.facebook.com”被阻止。同样(Likewise)，如果“https”被阻止，您可以尝试“HTTP”仅查看是否可以访问该网站。术语“HTTPS”表示安全连接，而“HTTP”是网站URL的未加密版本。
互联网选项 – 受限网站(Internet Options – Restricted Websites)和内容顾问(Content Advisor)
如果在HTTP(HTTP)和 https之间切换没有帮助，请检查您在尝试访问时收到的错误消息。如果显示“由于(Due)此帐户的限制”，则可能是家庭安全软件(Family Safety Software)。在这种情况下，除了尝试不需要安装并提供代理的便携式浏览器外，无能为力。我们一会儿再谈。
如果没有与帐户相关的消息，则该站点可能已被阻止使用Internet 选项(Options)。转到控制面板中的(Control Panel)Internet 选项(Options)，然后在安全(Security)选项卡上，单击Internet 安全区域中的受限网站(Restricted Websites)，然后单击标有“站点”的按钮（见下(See)图）。检查您要访问的网站的URL是否在此处列出。(URL)如果是，请选择URL并单击删除(Remove)。系统将提示您确认。完成后，该网站应该可以在您的任何浏览器上毫无问题地打开。
还有另一种方法可以阻止某些类型的网站打开 - 使用相同的Internet 选项(Options)对话框。单击(Click)“内容(Content)”选项卡。根据您的Windows版本，您可能会看到“内容顾问”或“家庭安全”按钮。此选项用于限制某些类型的网站为不同的用户打开。这意味着您可以使用该选项在用户级别阻止网站。如果您知道密码，您可以单击按钮并更改设置。如果没有，您必须征得父母或网络管理员的许可。在这里，您也可以使用便携式浏览器绕过限制。
使用便携式代理浏览器(Proxy Browser)访问受限网站(Access Restricted Websites)
您可以下载兼作代理的便携式浏览器，例如KProxy。本产品有便携型和安装型两种。网站浏览器的最佳之处在于，它无需在主URL栏中实际输入网站地址即可提供在线浏览。相反，您可以在KProxy网站中间的文本框中键入URL 。
相关(Related)：如何在 Microsoft Edge 中阻止网站(How to block a website in Microsoft Edge)。
使用不同的 DNS
当某个网站在某个区域被禁止时，是ISP阻止了进出该网站的流量。 将您的ISP的(ISP)DNS 设置更改(Changing DNS settings)为不同的设置可能有助于您访问该站点。例如，您可以将您的DNS更改为Google Public DNS。要更改DNS，请右键单击任务栏中的网络图标，然后选择打开网络(Open Network)和共享(Sharing)。在出现的窗口(Window)中，双击您的网络。它将弹出一个对话框，您可以在其中更改IPv4下的DNS。
阅读(Read)：如何解锁 YouTube 视频(How to unblock YouTube videos)。
使用代理(Proxy)访问受限网站(Access Restricted Websites)
(Proxy websites)只有在浏览器中输入URL(URL)后才能访问代理网站，它们将允许您使用该网站上的互联网连接浏览其他网站。代理服务器(Proxy server)就像一个代理站点 - 不同之处在于 - 您将获得一个 IP 地址，该地址将在您的浏览器中设置，您可以使用该地址浏览互联网。
您可以使用代理网站或程序来访问您所在地区被阻止的网站。UltraSurf就是这样一种代理。这是专门为允许某个国家/地区的人口访问社交网站而设计的。有些网站可让您轻松访问和打开被阻止的网站。OpenBlockedWebsite.com和HideMyAss.com 是您可能想要查看的两个此类网站。他们充当免费的网络匿名者，旨在解锁被阻止的网站并提供免费的匿名网络冲浪。另外，请查看Hola Unblocker。
这些方法可帮助您访问受家庭网络、公司LAN(LANs)限制或在您所在国家/地区被禁止的网站。
如果您无法在 Internet Explorer 中打开特定网站，(cannot open a particular website in Internet Explorer)请阅读这篇文章。
如果您有任何想法或技巧要分享，请使用下面的评论框。
How to unblock and access Blocked or Restricted Websites
Websites can be blocked at three levels: Computer level, Network level or the ISP/Governmental level. Some DNS services, such as Open DNS, too provide options to block certain types of websites for different users sharing the computer. Then, there are some software other than the built-in “Restricted Websites” in Internet Options that help in blocking a website. We’ll not be talking about how to block a website. Rather, we’ll focus on how to access a website that is restricted on your workstation by network admins and ISPs (Internet Service Provider).
Access Restricted Websites
The article is an expansion of our other article on what to do when a website does not open. Some of the tips may be repeated in this article. So if you find that you are unable to open or access some websites, here are a few things you may want to try out.
Is The Website Down?
You may not be able to access a particular website due to some outages. Check with these website monitors. The check – Is a website up or down. It will tell you if a blog or website is working, online, up, down right now, or not to anyone or everyone.
Read: How to blacklist or block websites in Chrome, Edge, Firefox on Windows.
Access Blocked Websites Blocked on a Computer
There are different options to access a website, and they depend on the mode used to block the site. For example, Open DNS employs a category system, and if you wish to go to a category that your parents have chosen to block it for you, it will provide a notification.
HTTP and HTTPS
The first thing to try is to add or remove an “s” to the “HTTP” preceding the website URL. For example, typing in https://www.facebook.com may open it for you because only “http://www.facebook.com” was blocked. Likewise, if it was “https” blocked, you can try “HTTP” only to see if you can access the website. The term “HTTPS” represents a secure connection while the “HTTP” is the unencrypted version of the website URL.
Internet Options – Restricted Websites & Content Advisor
If toggling between HTTP and https does not help, check the error message you are getting when trying to access. If it says “Due to Restrictions On This Account”, it could be a Family Safety Software. Not much can be done in this case except to try portable browsers that do not need to be installed and offer proxy as well. We’ll get to that in a while.
If there is no account-related message, probably the site has been blocked using Internet Options. Go to Internet Options in Control Panel and on the Security tab, click on Restricted Websites in the Internet Security Zone, and then on the button labeled “Sites” (See image below). Check if the URL of the website you wish to access is listed there. If yes, select the URL and click Remove. You’ll be prompted for confirmation. That done, the website should open without any problems on any of your browsers.
There is yet another method to block certain types of websites from opening – using the same Internet Options dialog box. Click on the Content tab. Based on your version of Windows, you might see “Content Advisor” or “Family Safety” button. This option is used to restrict certain types of websites from opening for different users. That means you can use the option to block websites at the user level. If you know the password, you can click the button and change the settings. If not, you will have to ask permission from your parents or network admin. Here too, you can use a portable browser to bypass restrictions.
Using A Portable Proxy Browser To Access Restricted Websites
You can download a portable browser that doubles up as a proxy such as KProxy. This product has both portable and installation type versions. The best thing about the website browser is that it offers online browsing without actually typing the website address in the main URL bar. Instead, you type the URL in the text box given in the middle of the KProxy website.
Related: How to block a website in Microsoft Edge.
Using A Different DNS
When some website is banned in an area, it is the ISP blocking traffic to and from that website. Changing DNS settings from your ISP to something different might help you access the site. For example, you can change your DNS to Google Public DNS. To change DNS, right-click the network icon in the taskbar and select Open Network and Sharing. In the Window that appears, double-click on your network. It will bring up a dialog box and there you can change the DNS under IPv4.
Read: How to unblock YouTube videos.
Use a Proxy To Access Restricted Websites
Proxy websites are accessed only after entering the URL in your browser, and they will allow you to browse other websites by using the internet connection on that website. A Proxy server is like a proxy site – the difference being – you will be given an IP address that will get set up in your browser using which you will be able to surf the internet.
You may use proxy websites or programs to access websites blocked in your area. One such proxy is UltraSurf. This was specifically designed to allow the population of a certain country to access social networking sites. There are some websites that let you easily access and open blocked websites. OpenBlockedWebsite.com and HideMyAss.com are two such websites you may want to check out. They act as free web anonymizers that aim to unblock blocked websites and offer free anonymous web surfing. Also, check out Hola Unblocker.
These are some methods that will help you access websites restricted on your home network, corporate LANs, or the ones banned in your country.
Read this post if you cannot open a particular website in Internet Explorer.
If you have any ideas or tips to share, please use the comments box below.
