GitHub Enterprise sign-in fails with "No auth flow succeeded" using OAuth and PAT on VPN

[gaglio00]

🐛 Describe the bug VS Code fails to authenticate with our GitHub Enterprise server (https://git.cedacrigroup.it) via any supported auth flow. After attempting both OAuth and Personal Access Token (PAT), the error Sign in failed: Error: No auth flow succeeded is always shown.

🔁 To Reproduce Steps to reproduce the behavior: Connected to company VPN Open VS Code (latest version)

Sign in to GitHub Enterprise: OAuth → browser opens, but fails to complete flow Device code → hangs or fails PAT → accepted, then "No auth flow succeeded" error VS Code never completes login

✅ Expected behavior Login to GitHub Enterprise (git.cedacrigroup.it) should complete either via OAuth, device code, or PAT. The GitHub Pull Requests and Issues extension should be able to authenticate properly.

📷 Screenshots OAuth failure: Sign in failed: Error: No auth flow succeeded.

PAT failure: Same message after entering token.

Extension prompt appears but does not finish.

📦 Extension Version github.vscode-pull-request-github: 0.112.0 ms-vscode.azure-repos: 0.40.0 github.vscode-github-actions: 0.27.2

VS Code: 1.101.2 (user setup)

OS: Windows 11 VPN: Yes (corporate)

📎 Additional context The GitHub Enterprise server is reachable in browser (https://git.cedacrigroup.it) SSO might be enabled on the enterprise server Tried setting github.gitAuthenticationHosts and github.enterpriseServer in settings.json Also attempted to manually set github-enterprise.uri