A private IIS 10.0 website must only accept Secure Socket Layer (SSL) connections.

Transport Layer Security (TLS) encryption is a required security setting for a private web server. Encryption of private information is essential to ensuring data confidentiality. If private information is not encrypted, it can be intercepted and easily read by an unauthorized party. A private web server must use a FIPS 140-2-approved TLS version, and all non-FIPS-approved SSL versions must be disabled.

NIST SP 800-52 specifies the preferred configurations for government systems.

Note: If the server being reviewed is a public IIS 10.0 web server, this is Not Applicable. Note: If the server is hosting SharePoint, this is Not Applicable. Note: If the server is hosting WSUS, this is Not Applicable. Note: If the server is hosting Office Online Server (OOS), this is Not Applicable. Note: If SSL is installed on load balancer/proxy server through which traffic is routed to the IIS 10.0 server, and the IIS 10.0 server receives traffic from the load balancer/proxy server, the SSL requirement must be met on the load balancer/proxy server and is Not Applicable in this STIG.

Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager. Click the site name. Double-click the "SSL Settings" icon. Verify "Require SSL" check box is selected.

If the "Require SSL" check box is not selected, this is a finding.

Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Click the site name.

Double-click the "SSL Settings" icon.

Select "Require SSL" check box.

Select "Apply" from the "Actions" pane.