v5: Burn engine fails to elevate

[MatthiasRInst]

On some systems, our bootstrapper (WiX 5.0.0) fails to elevate. We do not use IEngine.Elevate(), so the user gets a UAC prompt when the Apply phase starts.

Log file says:

[39B4:32BC][2024-11-05T12:52:59]i299: Plan complete, result: 0x0
[39B4:32BC][2024-11-05T12:52:59]i300: Apply begin
[39B4:32BC][2024-11-05T12:52:59]i010: Launching elevated engine process.
[39B4:32BC][2024-11-05T12:53:39]i011: Launched elevated engine process.
[39B4:32BC][2024-11-05T12:53:39]e000: Error 0x80070006: Failed to wait for child to connect to pipe.
[39B4:32BC][2024-11-05T12:53:39]e000: Error 0x80070006: Failed to connect to elevated child process.
[39B4:32BC][2024-11-05T12:53:39]e000: Error 0x80070006: Failed to actually elevate.
[39B4:32BC][2024-11-05T12:53:39]e000: Error 0x80070006: Failed to elevate.

The "elevated" log file says:

[3130:3570][2024-11-05T12:53:34]i009: Command Line: '-q -burn.elevated ***** ***** *****'
[3130:3570][2024-11-05T12:53:39]e000: Error 0x8007006d: Failed to read size of verification secret from parent pipe.
[3130:3570][2024-11-05T12:53:39]e000: Error 0x8007006d: Failed to verify parent cache pipe: BurnPipe.{AA95F2E7-0ED5-4548-8436-80AF743E0E40}.Cache
[3130:3570][2024-11-05T12:53:39]e000: Error 0x8007006d: Failed to connect to unelevated process.
[3130:3570][2024-11-05T12:53:39]e000: Error 0x8007006d: Failed to run elevated mode.
[3130:3570][2024-11-05T12:53:39]i021: Exit code: 0x8007006d

This leaves me puzzled. Any idea about what happened here, why it may have happened, or what to do about it? As of now, I even have no idea about which pipes are supposed to be set up and which secrets are supposed to be verified.

[robmen]

Looks like something very low-level is going awry. You'll want to search for those log messages in the burn codebase and stick a debugger on it.

[mosBrkr]

Did you find a solution for that issue? We are actually facing the same behavior on some machines.