The Configuration tab of the Web Certificate page selects how Signotaur obtains the TLS certificate for its web server.

Choose one of four modes. The mode currently in use is marked Active; selecting a mode expands its settings.
Use an existing PKCS#12 file on disk. Renewal and rotation are manual.
.pfx file the Signotaur service can read.Use a certificate already installed in the Windows certificate store. Windows only.
Generate a self-signed certificate on the fly. Suitable for local or test use; clients must be told to trust it.
Use a certificate issued from the Managed Certificates page (by the Internal CA or by ADCS) and have Signotaur renew it automatically before expiry.
This is the recommended mode: the certificate is renewed automatically and applied to the running server without a restart. See Web Certificate Loading.
Use Managed CA requires an Enterprise license. Without one, the radio option is disabled. See Editions & Licensing.
If you select a Managed CA web-certificate mode without an Enterprise license, Signotaur issues a single managed web certificate, valid for up to 90 days and with no automatic renewal. This applies on a fresh install, and on the first v1-to-v2 upgrade that enables Managed CA. When that certificate expires while the server is still unlicensed, Signotaur automatically reverts the web certificate to a self-signed certificate. This happens in memory, leaving the configuration unchanged, with no administrator action required.
This grace is one-time per server and cannot be reset: once a managed web certificate has ever been issued, reconfiguring a Managed CA mode while unlicensed is blocked. Add an Enterprise license to keep using Managed CA. See Editions & Licensing.
Switching from the auto-managed mode to any manual mode (PFX file, Windows store, or self-signed) disables automatic renewal; the dialog warns you when this applies.
Click Apply to save the change. A confirmation dialog summarises the change before it is applied.
A certificate-source change is written to disk but takes effect only when the Signotaur service is restarted. The page shows a restart-pending notice until the service is restarted.