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.

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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.

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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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