What could be causing a 503 error?
Can you elaborate a little more on where you are getting this error? You posted this in ArcGIS Online. I found a support article con a 503 error: Error: HTTP Status 503 - Web services handler not initialized , but this is related to ArcGIS Server and probably not relevant for your situation.
This was happening under developers.arcgis.com. I later signed out and signed in again and the error disappeared. When I view the layer through ArcGIS online, the map would indicate that it cannot load the layer. I went incognito and the problem disappeared.
It sounds like it's solved. But, moving forward, screenshots are helpful too.
An example is the snapshot above, when I try to open the Geoform on normal chrome browser. On trying to load the respective webmap, I get the error below:
The same opens properly when am in incognito
Just to verify, in a normal session you log in with an AGOL account (what type of account is this)? When you go incognito do you sign in or are you accessing the layer anonymously?
I have multiple errors on web maps and Hosted feature services today, Same 503 errors, features not loading in webapps, ArcGIS Pro time outs etc.
All hosted on the 7 hive. https://services7.arcgis.com/Q1bahANZxFra3G0H/ArcGIS/rest/services
Getting multiple hosted feature load errors on web map refreshes.
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