Issue
All of our replays just display as blank pages. What could be causing this?
Applies To
All SaaS Customers
Session Replay
Symptoms
Basic Sentry SDK setup
If using Self-Hosted Sentry, the same replays appear normally
Resolution
The most likely cause here could be your CORS policy. When viewing a replay, Sentry's replay player runs in an iframe on sentry.io. For external resources (CSS, fonts, images) to render, your server must allow sentry.io to fetch them. Therefore, please add sentry.io to your CORS headers for your CSS/font files , ie.:
Access-Control-Allow-Origin: https://sentry.io
Or if you're serving static assets, ensure your CDN/server allows cross-origin requests from sentry.io.
This could also be related to changes in Chrome 142 around public sites accessing local networks.