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The protocol that IIS uses is selected in the following order of preference:

  1. PCT 1.0
  2. SSL 3.0
  3. SSL 2.0

For more information on how to use only SSL 3.0, refer to the following Microsoft article: How to disable PCT 1.0, SSL 2.0, SSL 3.0, or TLS 1.0 in Internet Information Services.