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Fix PuTTY Connection Refused: Check SSH Service - Windows 10 ERR_SSL_PROTOCOL_ERROR Troubleshooting Guide-Windows Defender Setup Error 504 Troubleshooting

2026-06-13 12:29:11
Fix PuTTY Connection Refused: Check SSH Service - Windows 10 ERR_SSL_PROTOCOL_ERROR Troubleshooting Guide-Windows Defender Setup Error 504 Troubleshooting

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.