Why Google Ads Resets Connections on Sequoia
Google Ads (the web-based advertising platform) is hosted on Google’s GCP with Cloudflare as the CDN layer. The platform uses TLS 1.3 with ECH for all authenticated sessions including campaigns, keywords, and reporting. When users access Google Ads from macOS Safari on networks with SSL inspection, the ISP gateway resets the ECH-enabled ClientHello, causing the TLS handshake to fail.
Google Cloud Load Balancer’s TLS configuration supports TLS 1.2 fallback, but Cloudflare’s edge policy requires ECH for TLS 1.3 and only offers TLS 1.2 fallback when explicitly signaled by the client. ISP gateways that strip the TLS 1.2 signal cause Cloudflare to assume TLS 1.3-only support, which fails.
Browser Integrity Sync on Google’s Ad Infrastructure
Google Ads uses browser integrity sync across Google’s global infrastructure to prevent unauthorized access to advertising accounts and prevent click fraud. When the TLS handshake is interrupted, the integrity sync fails, and Google’s security layer blocks the user’s access, requiring re-authentication.
Fixing Google Ads Connection Resets
Disabling QUIC in Chrome
Google’s Cloudflare configuration supports HTTP/3 (QUIC), which can be blocked by ISP gateways. Download Chrome → Settings → Advanced → System → disable Use QUIC protocol. Access Google Ads in Chrome — with QUIC disabled, Chrome uses HTTP/2 over TCP, which ISP gateways handle reliably.
Switching DNS to Google Public DNS
Navigate to System Settings → Network → Wi-Fi → Details → DNS. Set DNS servers to 8.8.8.8 and 8.8.4.4. Google DNS resolves Google’s CDN endpoints to the nearest healthy edge node with the lowest latency for your location.
Using Firefox with TLS 1.2 Maximum
Download Firefox → navigate to about:config → security.tls.version.max → set to 3. Access Google Ads in Firefox — TLS 1.2 does not require ECH, allowing the handshake to complete through ISP gateways that block ECH.
Call to Action
Use the webs.ninja network lab to verify connectivity to Google Ads endpoints. The diagnostic identifies whether the reset is caused by your ISP’s gateway, a Cloudflare edge node failure, or Google’s GCP infrastructure, directing the fix to the correct layer.