一旦到达限定数量，服务器就会拒绝新到的请求，因此，该参数限制了系统的可伸缩性。
Once this limit is reached, new requests are rejected and hence limits scalability of the system.
如果服务器不能实施该项指令，或者拒绝进入，它可以用否定回应参数发出安全进入指令作为回应。
If the Server cannot execute the service, or if access is denied, it shall issue a SecurityAccess response primitive with the Negative response parameters.
权限参数现在支持明确拒绝许可使用某项功能，以及允许和不允许该功能。拒绝不能由一组个别成员所覆盖。
The Permissions parameter now supports explicitly denying permission to use a feature, as well as allowing and not allowing that feature.
权限参数现在支持明确拒绝许可使用某项功能，以及允许和不允许该功能。拒绝不能由一组个别成员所覆盖。
The Permissions parameter now supports explicitly denying permission to use a feature, as well as allowing and not allowing that feature.
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