Why Amazon Vendors Central Resets Connections on Sequoia
Amazon Vendors Central (AVC) is hosted on AWS with CloudFront as the CDN layer, and like other Amazon properties, it enforces TLS 1.3 with ECH for all vendor sessions. When vendors access AVC from macOS Safari on networks with SSL inspection, the ISP gateway resets the ECH-enabled ClientHello, preventing the TLS handshake from completing and resulting in ERR_CONNECTION_RESET.
Amazon’s AWS infrastructure uses a global load balancer configuration that requires ECH for TLS 1.3 connections — there is no TLS 1.2 fallback option for authenticated vendor sessions. When the ISP gateway resets the ECH-enabled ClientHello, the handshake fails without any fallback mechanism.
Browser Integrity Sync on Amazon Vendor Infrastructure
Amazon Vendors Central uses browser integrity sync to validate vendor sessions across AWS’s global load balancer network. When the TLS handshake is interrupted, the integrity sync fails, and AWS’s security layer blocks the vendor’s access, requiring re-authentication with a complete TLS handshake from a browser that supports ECH.
Fixing Amazon Vendors Central Connection Resets
Using Chrome with ECH Flags
Download Chrome → modify the shortcut target to include --disable-ECH. Launch Chrome with this flag and access Vendors Central. The flag forces Chrome to signal TLS 1.2 preference to CloudFront, potentially triggering a TLS 1.2 fallback that Amazon’s infrastructure supports for legacy clients.
Configuring Proxy to Bypass Amazon Domains
In macOS, navigate to System Settings → Network → Wi-Fi → Details → Proxy. Add *.amazon.com, *.amazonsellers.com, *.vendorscentral.amazon.com to the bypass list. This routes Amazon vendor traffic without SSL inspection, allowing ECH to function.
Disabling Corporate SSL Inspection
If you are on a corporate network, request that your IT department add Amazon’s vendor domains to the SSL inspection exception list. This is a standard request for corporate networks that need to access AWS-hosted applications with modern TLS configurations.
Call to Action
Use the webs.ninja network lab to run a TLS handshake diagnostic for Amazon Vendors Central. The diagnostic identifies whether the reset is caused by your ISP’s gateway, a CloudFront edge node failure, or AWS’s platform infrastructure, directing the fix to the correct layer.