Fleet update fails wit missing .asc file

[drummbelbummel]

Elasticsearch Version

Version: 8.17.4, Build: deb/c63c7f5f8ce7d2e4805b7b3d842e7e792d84dda1/2025-03-20T15:39:59.811110136Z, JVM: 23

Installed Plugins

No response

Java Version

JVM: 23

OS Version

different linux

Problem Description

I want to update my agents via fleet. What is working fine on windows fails on linux. Tested with kali linux, kali purple, proxmox and an old debian.
Every time it is a missing .asc file.
If i go to them machine and download the file with wget while the fleet update is running - everything is working fine.
As i can download the file with wget in the machine itself i can not see any cause in the infrastructure?

Steps to Reproduce

Start agent update via fleet, wait to fail, check agent status

Logs (if relevant)

┌──(root㉿yoga-2-purple)-[/home/kali]
└─# /opt/Elastic/Agent/elastic-agent status
┌─ fleet
│ └─ status: (HEALTHY) Connected
├─ elastic-agent
│ └─ status: (HEALTHY) Running
└─ upgrade_details
├─ target_version: 8.17.4
├─ state: UPG_FAILED
├─ action_id: 2a18eb82-9f3f-456a-bbbb-07fbfa30ec7f
└─ metadata
├─ failed_state: UPG_DOWNLOADING
└─ error_msg: failed verification of agent binary: could not get .asc file: fetching asc file from '/opt/Elastic/Agent/data/elastic-agent-8.17.3-0efe49/downloads/elastic-agent-8.17.4-linux-x86_64.tar.gz.asc': open /opt/Elastic/Agent/data/elastic-agent-8.17.3-0efe49/downloads/elastic-agent-8.17.4-linux-x86_64.tar.gz.asc: no such file or directory
fetching asc file from https://artifacts.elastic.co/downloads/beats/elastic-agent/elastic-agent-8.17.4-linux-x86_64.tar.gz.asc: failed loading public key: Get "https://artifacts.elastic.co/downloads/beats/elastic-agent/elastic-agent-8.17.4-linux-x86_64.tar.gz.asc": context deadline exceeded

[elastic_agent][error] upgrade to version 8.17.4 failed: failed verification of agent binary: could not get .asc file: fetching asc file from '/opt/Elastic/Agent/data/elastic-agent-8.17.3-0efe49/downloads/elastic-agent-8.17.4-linux-x86_64.tar.gz.asc': open /opt/Elastic/Agent/data/elastic-agent-8.17.3-0efe49/downloads/elastic-agent-8.17.4-linux-x86_64.tar.gz.asc: no such file or directory
fetching asc file from https://artifacts.elastic.co/downloads/beats/elastic-agent/elastic-agent-8.17.4-linux-x86_64.tar.gz.asc: failed loading public key: Get "https://artifacts.elastic.co/downloads/beats/elastic-agent/elastic-agent-8.17.4-linux-x86_64.tar.gz.asc": context deadline exceeded

[jbaiera]

Thanks for your interest in the Elasticsearch project. Unfortunately, this looks like it might be some kind of issue with another Elastic product. I would try reopening this issue against an Elastic project that most aligns with the problem you're experiencing (maybe https://github.com/elastic/fleet-server, there are a few for fleet/agent).