当服务器无法处理用户的请求时，它会显示HTTP状态代码错误：HTTP Error 503。错误本身表明，服务器因维护而停机或当前超载。因此，在尝试连接到Outlook Web Access或任何类似的 Web 应用程序时，如果网站无法加载，并且您看到错误消息，请按照HTTP 错误 503，服务不可用^{(HTTP Error 503, The service is unavailable)}错误中的说明进行操作。

Http错误503服务不可用

HTTP错误503^{(HTTP Error 503)}，服务不可用

HTTP 错误 503 是HTTP 状态代码错误^{(HTTP status code error)}。它表示您访问的服务器当前不可用。因此，尽管如果问题在服务器端仍然存在，您无法解决问题，但这里有一些可能会有所帮助的解决方案！

几分钟后清除缓存并重新加载网页
更正电脑或路由器的DNS配置^(DNS)
将Load User Profile^{(Change Load User Profile)}从True更改为False。

让我们详细介绍一下这个过程！

1]重新加载页面

出问题了

^{(Clear cache)}几分钟后清除缓存并重新加载网页。该站点可能因流量过大而不堪重负，或者您的浏览器缓存已损坏。因此，重新加载页面可能会有所帮助。大多数浏览器（如Google Chrome、Mozilla Firefox和Microsoft Edge）在地址栏的某处都有一个刷新按钮。^(Refresh)只需^(Just)按下按钮，看看它是否能解决问题。

修复^(Fix)：错误 503 服务在 Steam 上不可用。^{(Error 503 Service Unavailable on Steam.)}

2]更正^(Correct)计算机或路由器的DNS配置^(DNS)

当计算机或路由器的DNS配置出现故障时，您可能还会看到“^(DNS)服务不可用 – DNS 失败^{(Service Unavailable – DNS Failur)}”消息。只需重新启动路由器即可纠正此类错误。如果所选DNS服务器出现问题，可以通过选择另一个DNS服务器来解决问题。

相关阅读^{(Related read)}：Web 应用程序 HTTP 错误 503 和 WAS 事件 5189^{(Web apps HTTP Error 503 and WAS event 5189)}。

3]将加载用户配置文件^{(Change Load User Profile)}从True更改为 False

在 Windows 10 中打开Internet 信息服务管理器。^{(Internet Information Service Manager)}

转到应用程序池^{(Application Pools)}。

高级设置

右键单击您的应用程序池^{(Application Pool)}并选择Advanced Settings。

当一个新窗口出现时，向下滚动到Process Model。

加载用户配置文件

单击加载用户配置文件^{(Load User Profile)}条目并将布尔^(Boolean)值从True更改为False。

单击确定^(OK)按钮并重新启动^(Restart)您的应用程序池^{(Application Pool)}。

此后^(Hereafter)，当您尝试浏览该网站时，您应该不会再看到错误HTTP 错误 503^{(HTTP Error 503)}。

HTTP Error 503, The service is unavailable problem

When a server cannot handle the request made by a user, it displays an HTTP status code error: HTTP Error 503. The error itself indicates, the server is down either fоr mаintenance or is currently overloaded. So, upon trying to connect to Outlook Web Acсess or any similar web applications, if the site fails to lоad, and you see the error messаgе, follow the instructions in the post to HTTP Error 503, The service is unavailable error.

HTTP Error 503, The service is unavailable

HTTP Error 503 is an HTTP status code error. It indicates that the server you are reaching is currently unavailable. So, although there’s not much you can do to fix the issue if it persists on the server-side, here are a few solutions that might help!

Clear cache and reload the Webpage after a few minutes
Correct the DNS configuration of the computer or the router
Change Load User Profile from True to False.

Let’s cover the process in a bit of detail!

1] Reload the page

Something Went Wrong

Clear cache and reload the Webpage after a few minutes. The site might be overburdened with heavy traffic or maybe your browser cache has become corrupted. So, reloading the page may help. Most browsers Like Google Chrome, Mozilla Firefox, and Microsoft Edge feature a Refresh button somewhere on the address bar. Just hit the button and see if it fixes the problem.

Fix: Error 503 Service Unavailable on Steam.

2] Correct the DNS configuration of the computer or the router

When there’s a fault with the DNS configuration of the computer or the router, you may see ‘Service Unavailable – DNS Failure’ message also. Such errors can be corrected by simply restarting the router. In the case of a problem with a selected DNS server, it may be fixed by choosing another DNS server to use.

Related read: Web apps HTTP Error 503 and WAS event 5189.

3] Change Load User Profile from True to False

Open Internet Information Service Manager in Windows 10.

Go to Application Pools.

Advanced Settings

Right-click on your Application Pool and choose Advanced Settings.

When a new window appears, scroll down to Process Model.

Load User Profile

Click on Load User Profile entry and change the Boolean value from True to False.

Click the OK button and Restart your Application Pool.

Hereafter, when you attempt to browse the website, you should not see the error HTTP Error 503 again.

琳吴

About the author

我是一名全职软件工程师，在使用 Windows 和 Mac 软件方面拥有超过 10 年的经验。我知道如何在两个平台上设计、测试和部署应用程序。我也有安全和系统管理方面的经验。我的技能和知识可以帮助您构建更好、更高效的计算机系统。

HTTP错误503，服务不可用问题

HTTP错误503^{(HTTP Error 503)}，服务不可用

1]重新加载页面

2]更正^(Correct)计算机或路由器的DNS配置^(DNS)

3]将加载用户配置文件^{(Change Load User Profile)}从True更改为 False

HTTP Error 503, The service is unavailable problem