TNG

Public Data Access Overview / Discussion Forum

April 2026: "504 Gateway Time-out" or "503 Service Unavailable"

Peter Phan
  • 1
  • 31 Mar

Hello Dylan,

I am attempting to download the file "http://www.tng-project.org/api/TNG-Cluster/files/snapshot-99.0.hdf5" using the command

wget -nc --content-disposition --header="API-Key: API_KEY" "http://www.tng-project.org/api/TNG-Cluster/files/snapshot-99.0.hdf5" (I've removed my personal api key here)

But I am getting the following output:

--2026-03-31 14:01:36--  http://www.tng-project.org/api/TNG-Cluster/files/snapshot-99.0.hdf5
Resolving www.tng-project.org (www.tng-project.org)... 130.183.17.94
Connecting to www.tng-project.org (www.tng-project.org)|130.183.17.94|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://www.tng-project.org/api/TNG-Cluster/files/snapshot-99.0.hdf5 [following]
--2026-03-31 14:01:37--  https://www.tng-project.org/api/TNG-Cluster/files/snapshot-99.0.hdf5
Connecting to www.tng-project.org (www.tng-project.org)|130.183.17.94|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://data-eu.tng-project.org/file/snapshot/L680n8192TNG/99/0/?token=18a8cc1dfd2b698cb551 [following]
--2026-03-31 14:01:37--  https://data-eu.tng-project.org/file/snapshot/L680n8192TNG/99/0/?token=18a8cc1dfd2b698cb551
Resolving data-eu.tng-project.org (data-eu.tng-project.org)... 130.183.17.94
Connecting to data-eu.tng-project.org (data-eu.tng-project.org)|130.183.17.94|:443... connected.
HTTP request sent, awaiting response... 504 Gateway Time-out
Retrying.

--2026-03-31 14:02:29--  (try: 2)  https://data-eu.tng-project.org/file/snapshot/L680n8192TNG/99/0/?token=18a8cc1dfd2b698cb551
Reusing existing connection to data-eu.tng-project.org:443.
HTTP request sent, awaiting response... 504 Gateway Time-out
Retrying.

--2026-03-31 14:03:21--  (try: 3)  https://data-eu.tng-project.org/file/snapshot/L680n8192TNG/99/0/?token=18a8cc1dfd2b698cb551
Reusing existing connection to data-eu.tng-project.org:443.
HTTP request sent, awaiting response... 503 Service Unavailable
2026-03-31 14:03:36 ERROR 503: Service Unavailable.

Additionally, I am getting a 403 Forbidden when I click the link (http://www.tng-project.org/api/TNG-Cluster/files/snapshot-99.0.hdf5) directly. Thank you for your time.

Philipp Denzel
  • 1 Apr

It seems I have the same issue (403 Forbidden) with the TNG50-1 snapshots. I tried downloading snapshot 99. It was just around the time when we switched to daylight saving time... coincidence?

Dylan Nelson
  • 17h

When I click on this link, it starts immediately and without problems.

Can you confirm that it still does not work?

Unfortunately the "504 Gateway Time-out" or "503 Service Unavailable" messages indicate temporary problems, that are pretty frequent right now (we are working on it), but resolve themselves. The only thing to do is try again later.

A "403 Forbidden" means either (i) you're not logged in with your browser when clicking the link, or (ii) you didn't send the API key, or sent the wrong one, in a wget-type request.

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