Hello,

64-bit Mac (Server or Client) can only use the New Layer, regardless of the 
settings.
32-bit Mac Clients can adapt "can adapt their protocol dynamically (doc)",
they start with the New Layer or automatically switch during initial connection.

http://doc.4d.com/4Dv15/4D/15.4/Network-and-Client-Server-options.300-3286409.en.html#1882948

The "ignored" thing means,
you can't connect a v14 Client to a v15 64-bit Server in the hope that it 
automatically updates itself to v15.

you have to either manually distribute v15 clients,
or run a v15 32-bit server for some time until all v14 clients are upgraded to 
v15,
at which point you can restart the application using 4D Server 64-bit.

obviously same rules apply for v16.

> 2017/03/07 6:51、Charles Miller via 4D_Tech <[email protected]> のメール:
> when the checkbox on compatibility for
> use legacy network layer (ignored on OS X 64 bit) is checked. What does
> this mean. If built server is 64 bit but clients are 32 bit which network
> layer is used. another way to ask
> Is Ignored on OSXC 64 bit related to server or client




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