You need to start SafeInCloud desktop app and keep it running in the background (no need to login, just running).
Make sure that your proxy settings bypass local addresses:
- Open the Internet Options dialog inside Internet Explorer (or from Control Panel)
- Select the Connections tab
- Press the LAN settings button
- Check Bypass proxy server for local addresses (only if it is enabled)
SafeInCloud is listening on localhost:19756
Also check that HTTP protocol is not blocked for localhost address. You can check this here: