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Fixed API Connection Issue Changed the Nginx proxy configuration from proxy_pass http://localhost:5000; to proxy_pass http://127.0.0.1:5000; in the container's configuration This resolved the "ERR_CONNECTION_REFUSED" error by ensuring proper communication between Nginx and the Flask backend within the Docker container Fixed Database Serialization Error Updated the Python imports in app.py to properly include the date class: from datetime import datetime, timedelta, date Modified the type checking code to correctly identify date objects: isinstance(value, (datetime, date)) This resolved the "isinstance() arg 2 must be a type or tuple of types" error that was preventing the application from retrieving warranty data These changes resolved the connection issues between frontend and backend components, allowing the application to successfully add and display warranty information.