topic Re: ERR_HTTP2_PROTOCOL ERROR in ArcGIS Enterprise Questions

ERR_HTTP2_PROTOCOL ERROR

MarcoPoetsch — Wed, 16 Jul 2025 04:08:16 GMT

Hi all,

I’m encountering an intermittent issue when navigating a web map that uses ArcGIS Server feature services on my Enterprise 11.1 environment.

As I pan or zoom, I sometimes get the following error in the browser console:
GET <service URL> net::ERR_HTTP2_PROTOCOL_ERROR

dojo.js:411 GET https://maps....../server/rest/services/..../..../Featur…tPdVQdKKKKGMufrIgeAMi9HzlcY9soAHQqv4EWldu2-GBfaizl4PLLOZDN33YynLok4DSTiU8. net::ERR_HTTP2_PROTOCOL_ERROR (anonymous) @ dojo.js:411 d @ dojo.js:35 q @ dojo.js:40 (anonymous) @ dojo.js:40 (anonymous) @ dojo.js:40 D @ dojo.js:407 (anonymous) @ dojo.js:416 d @ dojo.js:35 q @ dojo.js:40 Promise.then d @ dojo.js:36 q @ dojo.js:40 (anonymous) @ dojo.js:40 (anonymous) @ dojo.js:40 J @ dojo.js:415 (anonymous) @ dojo.js:401 d @ dojo.js:35 q @ dojo.js:40 Promise.then d @ dojo.js:36 q @ dojo.js:40 (anonymous) @ dojo.js:40 (anonymous) @ dojo.js:40 m @ dojo.js:399 (anonymous) @ dojo.js:397 d @ dojo.js:35 q @ dojo.js:40 Promise.then d @ dojo.js:36 q @ dojo.js:40 (anonymous) @ dojo.js:40 (anonymous) @ dojo.js:40 request @ dojo.js:398 t._onInvokeMessage @ dojo.js:1732 t._onMessage @ dojo.js:1732

Some layers fail to load immediately but eventually appear after a delay. Occasionally, none of the services load at all — for any users — and everything times out. After about a minute, things recover and start working normally again. This seems to happen at random, and we haven’t made any recent changes to the services or server configuration. Has anyone experienced similar issues with ArcGIS Server and HTTP/2? Could this be related to server load, proxy configuration, or something else?

Would appreciate any pointers for troubleshooting.

Thanks!

Re: ERR_HTTP2_PROTOCOL ERROR

CodyPatterson — Wed, 16 Jul 2025 17:34:32 GMT

Hey @MarcoPoetsch

From the item you linked, it looks like an error within the console showing which files ended up failing or similar. Can you send a screenshot of the console and network page to see if any requests failed? Here's a couple additional places I'd check:

Check the server manager logs, see if anything at that time ended up freaking out.
Check any proxy logs, they may show a broken connection or similar
If using ArcGIS Monitor, verify that everything is showing normal around this time, and if not, check to see if resources are near maxed
If there is no Monitor, check Linux resource usage or Windows Task Manager to view the usage
Record what you're doing when it does this, maybe it isn't random and tied to something underlying

These are the things I'd try, hope it help!

Cody

Re: ERR_HTTP2_PROTOCOL ERROR

MaximilianFeuerer — Fri, 10 Oct 2025 06:24:05 GMT

Hi @MarcoPoetsch,

Have you tried using Firefox for your workflow? Perhaps there is a connection to BUG-000168562 for Portal for ArcGIS

Best,

Maximilian