If your PS4 system software is outdated, the "Get Info" request from a newer app version will fail.
Capture cards and link software rely on USB 3.0 speeds. If you have multiple peripherals (keyboards, mice, external hard drives) plugged into the same USB controller, the PS4 (or your PC) fails to allocate enough bandwidth for the video link, resulting in a DPI handshake failure.
If the error persists after all steps, the specific third-party tool is likely abandoned and incompatible with current PS4 firmware.
Verify your PC's IP address and ensure no firewall is blocking the connection. If the DPIServer.log file is empty, it often means the PS4 cannot connect back to the PC.