cannot reach official servers to verify your credentials. While unofficial "cracks" are often used to bypass these checks, they frequently fail because Revit 2021—and all Autodesk products from that version onward—no longer support manual offline activation Common Causes for the "Connection Required" Error
If you are a student or educator, you can obtain a legitimate free license that bypasses the need for unauthorized "cracks," which are often the source of unstable connection requirements. revit 2021 crack internet connection required