这表示服务不可用或用户登录已过期。
This indicates that the service is unavailable or that the user login has expired.
如果服务不可用，则允许我们缓存同义词。
This allows us to cache our synonyms if the service is not available.
攻击会导致系统上产生大量套接字连接请求，最终导致服务不可用。
The attack eventually makes the service unavailable by establishing thousands of socket connection requests with the vulnerable system.
当本地服务不可用时，将请求透明地重路由到其他地方的服务提供者。
When a local service is unavailable, requests are transparently rerouted to a service provider elsewhere.
当前受支持的SCA运行时异常有服务运行时异常和服务不可用异常。
Currently supported SCA Runtime exceptions are Service Runtime exception and Service Unavailable exception.
唯一的弱点是：对于允许Macs和GNU/Linux的PC来说其服务不可用。
The only weak point: The service isn’t available for Macs and GNU/Linux powered PCs.
错误；例如，当您的代码由于预期的服务不可用而不再能够继续执行的时候。
Errors; for example, when your code is no longer able to continue because an expected service is not available.
例如，IT服务提供商需要计算在服务不可用时间段内所遭受的商业损失。
For example, IT service providers need to calculate business losses when their infrastructures are unavailable.
在简介部分已经提到，我们假定客户注册服务不可用并且所有调用都返回异常。
As already mentioned in the introduction, we assume the customer registration service is not available and all calls return with an exception.
在请求出错或服务不可用而抛出运行时错误时，恢复系统会持续生成失败事件。
The recovery system keeps generating the failed events as the requests flow into faulty or unavailable service that is throwing the runtime errors.
如果真的这样做的话，将导致服务不可用，因为需要的程序文件已经被删除了。
Doing that, if you could, would leave the server in an unusable state, because program files that are required by the instrumentation would be missing.
如果系统或服务不可用，合法用户就无法使用受攻击系统上的网络服务(见图2)。
Once the system or service has been made unavailable, legitimate clients are blocked from using the network service hosted by the system under attack (See Figure 2).
如果出现临时系统错误、网络故障或服务不可用，准备调用过程中使用的数据将丢失。
If temporary system errors, network failures, or service unavailability occur, the data used in preparation of the call is lost.
服务不可用，控制连接关闭。这可能是对任何命令的回应，如果服务认为它必须关闭。
Service not available, closing control connection. This may be a reply to any command if the service knows it must shut down.
这些定制的场景通常使用由itcam forSOA提供的服务不可用性属性和指标。
These customized situations typically use the service unavailability attributes and metrics that are provided by ITCAM for SOA.
服务不可用，控制连接关闭。这也许是对任何命令的回应，假如服务认为它必须关闭。
Service not available closing control connection. This may be a reply to any command if the service knows it must shut down.
正如您所见，del . icio . us返回了HTTP 503(服务不可用状态代码)。
As you can see, del.icio.us was returning an HTTP 503 (Service Unavailable status code).
连接用户数已满……服务不可用，控制连接关闭。这可能是对任何命令的回应，如果服务认为它必须关闭。
Too many user...... service not available, closing control connection. This may be a reply to any command if the service knows it must shut down.
如果服务不可用了，组件也就失效了；如果一个新服务出现，那么就创建一个新的实例，并将该服务重新绑定。
If the service goes away, the component is deactivated; and if a new service arrives, then a new instance is created and the service re-bound.
服务不可用，控制连接关闭。这可能是对任何命令的回应，如果服务认为它必须关闭。最可能是目前人太多。
Service not available, closing control connection. This may be a reply to any command if the service knows it must shut down.
此外，如果服务不可用(数据库不存在，或数据库临时停掉了)，那么这个方法会返回null以说明该服务不可用。
Furthermore, if the service isn't available (there isn't a database, or the database has been temporarily stopped), then this method returns null to indicate that no such service is available.
在现实生活中，您可以使用选项板中的活动来添加逻辑以防返回错误、服务不可用时重试、或其他您可能需要的处理逻辑。
In a real life implementation, you use the activities in the palette to add logic in case a fault was returned, retries if the service is not available, or other processing logic you may need.
该模式允许用户在连接可用时使用服务器连接，而在连接不可用时提供脱机体验。
This pattern allows users to take advantage of server connectivity when available and provide an offline experience when connectivity is not possible.
如果RADIUS服务器不可用，则使用NAS的本地用户数据库密码。
If a RADIUS server is not available, use the NAS's local user database password.
对于这样的应用程序，WebSphere ApplicationServer所提供的几乎所有的服务质量都不可用。
Virtually all of the qualities of service that WebSphere application Server provides aren't available to such applications.
因为没有客户机应用程序容器，所以由容器扩展的任何附加服务都不可用于应用程序。
Because there is no client application container, any additional service extended by the container will not be available to the application.
然而，如果远程合作伙伴服务或者其绑定不可用，这时，需要为远程合作伙伴创建一个服务封装器。
However, if the remote partner service or its binding are unavailable, then you need to create a service wrapper for the remote partner.
如果机构服务繁忙或暂时不可用，通信可能(常常)会挂起或失败。
Communication may (and often does) hang or fail if the agency service is busy or temporarily unavailable.
当第一台服务器变得再次可用时，代理将继续工作，并处理当服务器不可用时可能会错过的所有文档。
When the first server becomes available again, the agent will catch up, and process all the documents that it might have missed while the server was unavailable.
当第一台服务器变得再次可用时，代理将继续工作，并处理当服务器不可用时可能会错过的所有文档。
When the first server becomes available again, the agent will catch up, and process all the documents that it might have missed while the server was unavailable.
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