The login server uses UDP as the transport protocol. SSL requires you to be using TCP so it cannot be used with the login server.
The login server cannot be changed to use TCP instead without changing the client, which is clearly not an option.
I fail to see any practical reasons for adding something like SSL into the mix. The client already encrypts the login credentials sent to the login server. That is what keeps almost everyone from just writing their own login server for lan use.
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