Why Google BigQuery Authentication Bypasses Your Proxy—And the Simple Fix

C# developers using Google BigQuery in enterprise environments often encounter a critical configuration gap: while data queries route through corporate proxies correctly, authentication and token refresh requests bypass the proxy entirely, causing timeouts and security failures. This issue stems from a subtle API distinction—using the Credential property instead of the GoogleCredential property on the client builder. Understanding this difference is essential for organizations requiring proxy-mediated access to cloud services, as misconfiguration can lead to both operational failures and compliance violations.