Cabal Checksum

You do realise that the server doesn't tell the client to DC, right? The client, itself, takes care of that. This means that you can prevent the client from disconnecting if it's the wrong version. The only sure way to prevent someone from using a different client is to use one of the methods I suggested.

They won't if magic key is changed... Just change your Magic Key on server and client and pack it.
 
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