!!! Overview
[{$pagename}] happens when new [Protocol] features or changes in behavior that were not known before [risks] ending up considered bad or illegal by such [systems] or [devices]. Often these boxes were deployed some time ago when the [protocols] had a feature set of that time. Introducing new features or changes in behavior that were not known before risks ending up considered bad or illegal by such boxes. Such traffic may well just be dropped or delayed to the degree that users really do not want to use those features.Changes to [TCP] or [TLS] also suffer from [{$pagename}]: some boxes between a [client] and the remote [server] will spot unknown new [TCP] options and block such connections since they do not know what the options are. If allowed to detect protocol details, systems learn how protocols typically behave and over time it becomes impossible to change them.

!! More Information
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