The "Strangler Fig" pattern is the de facto standard for modernizing monoliths, but it introduces a distinct architectural fracture: identity. When you place a Next.js micro-frontend alongside a legacy ASP.NET 4.x application, they live in different runtimes. A browser cookie issued by ASP.NET WebForms (encrypted with MachineKey) is an opaque, undecipherable blob to a Node.js server. Consequently, users navigating from /legacy/dashboard to /next/profile effectively "log out" because the Next.js server cannot validate the session credentials. This post details how to bridge that gap using YARP (Yet Another Reverse Proxy) as an authentication gateway, ensuring seamless session propagation without rewriting your legacy authentication logic immediately. The Root Cause: Incompatible Encryption The failure isn't in the transport; the browser successfully sends the cookie to both paths (assuming correct domain scope). The failure is in decryptio...
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