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With the release of the MSN Chat Control 4.2 and later, they blocked this proxy method by having the chat control hash the IP address of the server to which it was instructed to connect into the response to the challenge in authentication.
Users found a way to authorize by a "Proxy Method", forcing the Chat Control to bridge connections between m IRC and the Chat Network.
The other major platforms beside Internet Explorer that MSN Chat was supported on, was Netscape Navigator and MSNTV (formerly known as Web TV).
To ensure the MSN Chat network was only being connected to by authorized clients, Microsoft created and implemented a SASL based Security Service Provider authentication package known as Gate Keeper.
A few later third party clients could authenticate without the control and were adjusted to compensate for this change.
The versions of MSN Chat were designed from IRC3 through to IRC8, Even with the newer versions, MSN Chat still had the possibility to replicate older MSN Chat versions by issuing the IRCVERS command.