Farbar Service Scanner, or FSS, is a lightweight portable tool used to diagnose network connectivity issues directly related to missing or corrupted Windows services.

After running a scan with the FSS tool it will then provide you with an easy to read report with the findings. This report will then help you identify the source of any connectivity problems. This can be essential for instance, when you have successfully removed malware from the OS but you still are unable to connect to the internet.

Farbar Service Scanner checks the following:

RpcSs

PlugPlay

Internet Services

Windows Firewall

System Restore

Security Center/Action Center

Windows Update

Windows Defender