When the packet has timed out and purged from the cache, change the error message from previously processed to token expired.

当包已经超时并从高速缓存中被清除时，将错误消息从先前已被处理更改为令牌失效。

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A packet sniffer for a token ring network could detect that the token has been lost or the presence of too many tokens (verifying the protocol).

一网络分析的令牌环网络可以检测到令牌已遗失或存在太多的凭证(核查协议)。

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