Common OpenIddict Misconfigurations That Turn Security Gaps Into Vulnerabilities

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A technical guide highlights the most frequent mistakes .NET developers make when configuring OpenIddict, an open-source authorization server framework, from scratch. One critical error is using development certificates in production environments, where ephemeral in-memory certificates invalidate all active user sessions on every application restart. In load-balanced deployments, this causes tokens signed by one server instance to be rejected by others, leading to unpredictable authentication failures. Another common pitfall is failing to set explicit token lifetimes, with overly long access tokens giving attackers an extended window to exploit stolen credentials. The article recommends persistent, shared certificates and short access token lifetimes — typically around 15 minutes — as baseline production security practices.

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