Open Command Prompt as Administrator and run:
netsh int ipv4 set dynamicport tcp start=49152 num=16384
netsh int ipv4 set dynamicport udp start=49152 num=16384
reg add HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters /v ReservedPorts /t REG_MULTI_SZ /d "25" /f
Why this works: It forces Windows to release port 25, allowing the scanner to bind correctly. download upd speed smtp scanner v25 fix
After downloading UPD_Speed_SMTP_v25.zip, verify the SHA-256 hash: Open Command Prompt as Administrator and run: netsh
Expected hash: 7A3F8D9C2B4E1F6A8C0D4E2B8F7A3D1E5C9B2A4F6E8D0C1B3A5F7D9E2C4B6A8
(Always confirm against community-posted hashes on the download page). Why this works: It forces Windows to release
Once the "fix" is applied, the tool will launch smoothly. Here’s how to use its core features: