Windows Certificate Management and IIS Renewal

Windows certificate management involves installing, storing, binding, renewing, and retiring X.509 certificates used by services such as IIS, Remote Desktop, Exchange, SQL Server, and WinRM, along with trusted root and intermediate certificates. On IIS servers, service certificates must be stored in the local machine certificate store with their private keys, while HTTPS bindings are maintained by HTTP.sys and reference a specific certificate thumbprint; therefore, replacing a certificate requires updating each relevant binding. Common renewal problems include importing certificates into the user rather than machine store, missing private keys, old bindings continuing to reference expired certificates, autoenrollment behavior, private-key permission issues, and complications across web farms or mixed SNI and IP-based bindings. IIS generally does not require a restart after bindings change, but manually renewing and rebinding certificates becomes difficult to manage as certificate lifetimes shorten and infrastructure grows. Automation options include per-server ACME clients such as win-acme, which can request, install, and rebind public certificates, or centralized certificate-management systems that issue, renew, distribute, import, and rebind certificates across multiple servers and environments.

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