[BUG]: Downloading Powershell task fails

[spaasis]

What happened?

Hi,

Our previously working pipelines suddenly started to break with either of these two errors:

Download all required tasks.
Downloading task: PowerShell (2.247.1)
##[error]The archive entry was compressed using an unsupported compression method.

Download all required tasks.
Downloading task: PowerShell (2.247.1)
##[error]A local file header is corrupt.

We're still gathering information, but the pipeline has worked at least on November 6th. Back then the pipeline did not explicitly download the powershell task:

Download all required tasks.
Checking job knob settings.
   Knob: ...
Finished checking job knob settings.

Versions

Agent running on Windows, here's the relevant capabilities. We have tried with multiple agents with the same configuration.

Agent.Version: 3.246.0
Agent.OSVersion: 10.0.20348

Environment type (Please select at least one enviroment where you face this issue)

• Self-Hosted
• Microsoft Hosted
• VMSS Pool
• Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

No response

Operation system

Windows 10

Version controll system

No response

Relevant log output

2024-11-13T09:12:44.3775432Z ##[section]Starting: Run database migrations to dev
2024-11-13T09:12:44.5910825Z ##[section]Starting: Initialize job
2024-11-13T09:12:44.5914533Z Agent name: 'XXX'
2024-11-13T09:12:44.5914800Z Agent machine name: 'XXX
2024-11-13T09:12:44.5914921Z Current agent version: '3.246.0'
2024-11-13T09:12:44.7108530Z Agent running as: 'XXX$'
2024-11-13T09:12:44.7108823Z Agent is running behind proxy server: 'XXX'
2024-11-13T09:12:44.7137861Z Prepare build directory.
2024-11-13T09:12:44.7417339Z Set build variables.
2024-11-13T09:12:44.7446379Z Download all required tasks.
2024-11-13T09:12:44.8563642Z Downloading task: PowerShell (2.247.1)
2024-11-13T09:12:48.8295954Z ##[error]A local file header is corrupt.
2024-11-13T09:12:48.8304266Z ##[section]Finishing: Initialize job
2024-11-13T09:12:48.8375190Z ##[section]Finishing: Run database migrations to dev

[spaasis]

The tiniest repro pipeline:

trigger: none

pool: onpremAgentPool

steps:
- task: PowerShell@2
  inputs:
    targetType: inline
    script: Get-Module

fails with

Download all required tasks.
Downloading task: PowerShell (2.247.1)
##[error]The archive entry was compressed using an unsupported compression method.
Finishing: Initialize job

[spaasis]

Turns out to have been caused by our overzealous security proxy, which apparently prevented parts of the zip file to download