I have been experiencing consistent Codex terminal failures for several months across multiple browsers, networks, and troubleshooting attempts. The issue manifests as:
Error Messages:
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“Terminal errored - An unexpected connection error occurred”
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Terminal shows “Disconnected” status immediately after container setup completes
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Build processes complete successfully, but terminal sessions cannot be maintained
Root Cause Identified: DNS resolution failure for oaiusercontent.com domain. Testing shows:
dig oaiusercontent.com +short
(returns blank - no resolution via Cloudflare 1.1.1.1 or Google 8.8.8.8)
Troubleshooting Completed:
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Multiple browsers (Chrome, Safari, Firefox) with clean profiles
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Network configurations (proxy settings cleared, firewall disabled)
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Different DNS servers (Cloudflare, Google)
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Multiple internet connections
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macOS network stack resets
This is NOT an isolated issue. Community posts confirm other users experiencing identical problems:
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“Failed to upload to files oaiusercontent com” errors (July 2024)
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“Terminal errored - An unexpected error occurred” (July 2025)
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Same DNS resolution failures for oaiusercontent.com domain
Technical Evidence: The oaiusercontent.com domain fails to resolve via any public DNS resolver, indicating an infrastructure problem on OpenAI’s end rather than client-side network issues.
Request: This requires escalation to OpenAI’s infrastructure engineering team. The domain configuration for oaiusercontent.com appears broken, affecting Codex terminal streaming globally. This is not resolvable through user-side troubleshooting.
Workaround: Codex CLI functions normally, confirming the issue is specific to the web-based terminal infrastructure.