The short answer
Connection refused often means the target is reachable but the selected service is not listening. Verify protocol enablement and the actual service port rather than changing passwords first.
Work through the checks
Identify the camera by model, hardware revision, firmware and MAC address. Keep this inventory separate from passwords; two devices with similar names may expose different protocols.
Read the camera address in your router’s DHCP client list or the manufacturer’s local setup tool. Confirm the entry against the MAC address instead of guessing an address.
Check the model manual for an ONVIF service switch and any separate ONVIF account. Use the configured service port; do not assume it equals the RTSP port.
Copy the RTSP path from the documentation for the exact product family. Keep the address, service port, channel and main/substream selector as separate values during diagnosis.
What to verify
Test only the configured device and service port from the Windows computer. A successful TCP connection proves reachability to that port, not correct credentials or a decoded video image.
Sources and scope
AeoCam is available for Windows. Camera settings below describe protocol preparation, not a certification of a particular camera or a promise of every feature in every app version. Check the installed build and the Microsoft Store listing for current availability.
Vendor documents describe the camera or protocol. No physical-camera compatibility test is claimed here. Menus and capabilities can change with model and firmware.