Configuring NTLM authentication of a host that is not in a domain
To configure NTLM authentication of a host that is not in an Active Directory domain:
On enterprise LAN computers, in the browser settings, specify the fully qualified domain name (FQDN) of the server hosting the Squid service as the proxy server.
To save account credentials in the operating system and avoid having to enter them every time the browser starts, open Windows Credential Manager (Start → Control Panel → Credential Manager).
Click Add a Windows credential.
In the window that opens, specify the fully qualified domain name (FQDN) of the server hosting the Squid service and the domain account of the user.