Cannot Connect to Database Engine, Error 40, the system cannot find the file specified

How do I fix the error 'Named Pipes Provider, error 40 - Could not open a connection to' SQL Server'?

I tried using the local IP address to connect as well as a public one. I've tried:

Yes, the site can communicate with the server
Named pipes/TCP is enabled.
Remote connections are allowed.
Windows Firewall is off
Created an exception for port 1433 in Windows Firewall.
Enabled everything in SQL Server Configuration Manager.
What else can I do here?

Answer:
Solving this problem is very easy:

Go to control panel.
search for services.
Open Local services window from your search results
Restart your MSSQLSERVER service.