Unable to access Isaac SIm Assets

Omniverse Isaac Sim
1

6.0.0
5.1.0
5.0.0
4.5.0
4.2.0
4.1.0
4.0.0
4.5.0
2023.1.1
2023.1.0-hotfix.1
Other (please specify):

Operating System

Ubuntu 24.04
Ubuntu 22.04
Ubuntu 20.04
Windows 11
Windows 10
Other (please specify):

GPU Information

  • Model: RTX 5080 & RTX 4090
  • Driver Version:

Hi All,

I’m trying to use some existing Isaac Sim assets but the application keeps complaining about not being able to find the necessary resources from the AWS endpoint.

Screenshot from 2026-06-24 17-24-15
Screenshot from 2026-06-24 17-24-151920×1067 567 KB

However, if I go to the [https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.1/Isaac/Robots/AgilexRobotics/limo/limo.usd](asset address) manually, my browser is able to download it. What could be the issue?

2

Hi @dsonmez,

The “Warning: Isaac Sim Assets not found” dialog means Isaac Sim’s internal networking layer
(omni.client) could not reach the default cloud asset server at startup:

https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.1

This is a known issue when a firewall, corporate proxy, SSL inspection appliance, or network
policy blocks the OmniClient library’s connection to AWS S3 – even though the same URL opens
fine in a web browser. The browser and OmniClient use different network stacks and certificate
stores.

Quickest Fix: Download the Local Assets Pack

The officially supported solution for this is to download the assets locally and point Isaac Sim
at them. This works regardless of network restrictions.

Documentation:

If You Prefer to Fix the Network Connection

If you want to keep using cloud assets instead, check these first:

  1. Test S3 reachability from the terminal (not the browser):

    curl -I "https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.1/Isaac/Robots/"

    If this returns anything other than 200, your network or firewall is blocking it.

  2. Check your proxy settings: If your machine uses an HTTP/HTTPS proxy, make sure the
    relevant env vars are set before launching Isaac Sim:

    export https_proxy=http://your-proxy:port
./isaac-sim.sh

  3. Check the logs for the specific error:

    ~/.nvidia-omniverse/logs/Kit/Isaac-Sim Full/<version>/kit_<timestamp>.log

    Search for check_server_async or Failure: to see what OmniClient reports.

  4. Increase the timeout if it is a slow connection (default is 10 seconds):

    ./isaac-sim.sh --/persistent/isaac/asset_root/timeout=30.0

Please let us know which approach works for you, or share the relevant log lines if you continue
to see the error.

3

Hi @dsonmez, we wanted to follow up on the guidance provided above — downloading the local assets pack or adjusting your proxy/firewall settings should resolve the issue. Since we haven’t heard back, we’ll go ahead and close this thread. If you’re still experiencing the problem, please open a new topic and link back to this one so we can continue helping. Thank you!