Network & SSL connection help
Seeing a security warning on school, corporate, or public Wi-Fi? It is almost certainly your network inspecting HTTPS traffic. Blurrrer's certificate is valid and the app is secure.
What the warning looks like
Browsers may show a message such as:
- "Your connection is not private"
- "NET::ERR_CERT_AUTHORITY_INVALID"
- "This website sent back unusual and incorrect credentials"
- "HSTS error" or "the website uses HSTS"
This happens when a network firewall decrypts and re-encrypts your traffic, replacing the real certificate with one signed by a local authority.
Why this is not a Blurrrer security issue
Blurrrer serves a valid certificate issued by Google Trust Services (GTS) for blurrrer.org. We also use HSTS, which is the correct security behavior: it tells browsers to reject any fake certificate and only accept the real one.
Your network's SSL inspection system is the source of the warning. The same thing happens to Gmail, banking sites, and other HSTS-enabled services on those networks.
Quick fixes for users
- Switch to mobile data or a personal hotspot.
- Try a different network (home Wi-Fi, guest Wi-Fi).
- Ask your IT department to whitelist the domains below.
Allowlist checklist for IT administrators
Check off each domain or endpoint as it is allowlisted on your network. Progress is saved automatically in this browser.
App domains
These are the primary addresses users type to reach Blurrrer.
Hosting & platform
Required for the app shell and fallback access.
Backend services
Used for authentication, accounts, and optional AI features.
Optional first-run dependencies
Loaded only on the first OCR run. Public CDNs; no user content is sent.
All traffic is HTTPS on port 443. If your network uses SSL/TLS inspection, add the checked items to your inspection bypass or allowlist. This checklist auto-updates from /allowlist.json — no reinstall needed.
Download the IT guide
Send this document to your IT or security team. It contains the same allowlist, certificate details, and verification steps in a format ready to share.
Still blocked?
If your IT team has questions, contact us at support@blurrrer.app. Include the network type (school, corporate, public), the browser, and the exact error message.