# Updated Raspberry PI now Dashboard polling-xhr.js POST 404

**URL:** <https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386>\
**Category:** Dashboard\
**Created:** [4 February 2021 15:54 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386 "2021-02-04T15:54:46Z")\
**Posts on this page:** 17\
**Page:** 1

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**Author:** ![Gregor-Weissenborn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gregor-weissenborn/32/36508_2.png) [@Gregor-Weissenborn](https://discourse.nodered.org/u/Gregor-Weissenborn)\
**Post date:** [4 February 2021 15:54 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/1 "2021-02-04T15:54:46Z")

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Hello Community,

I yesterday updated / upgraded my Raspberry PI 3.  
Afterwards my Dashboard doesn't full load.  
It stays black.

In Chrome I see that all GET requests like i.e.  
[http://192.168.178.68:1880/ui/data/?EIO=3&transport=polling&t=NTjlL2X](http://192.168.178.68:1880/ui/data/?EIO=3&transport=polling&t=NTjlL2X)  
are successfull.  
But all POST request like i.e.  
[http://192.168.178.68:1880/ui/data/?EIO=3&transport=polling&t=NTjlauS](http://192.168.178.68:1880/ui/data/?EIO=3&transport=polling&t=NTjlauS)  
fail.

 ![grafik](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/3/b/3beeeb25b6c2ce677712047619e1882b31cff817.png)

Please save me!

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [4 February 2021 16:38 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/2 "2021-02-04T16:38:19Z")

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Welcome to the forum @Gregor-Weissenborn.  
In a terminal stop node red and start it again and then copy/paste the resulting log here. Copy/paste, not screenshot if possible please. When pasting it in use the `<>` button at the top of the forum entry window. You can stop/start node red using  
`node-red-stop`  
`node-red-start`

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<div class="post-metadata">

**Author:** ![Gregor-Weissenborn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gregor-weissenborn/32/36508_2.png) [@Gregor-Weissenborn](https://discourse.nodered.org/u/Gregor-Weissenborn)\
**Post date:** [4 February 2021 16:49 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/3 "2021-02-04T16:49:31Z")

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This is the output:

Start Node-RED

Once Node-RED has started, point a browser at [http://192.168.178.68:1880](http://192.168.178.68:1880)  
On Pi Node-RED works better with the Firefox or Chrome browser

Use sudo systemctl enable nodered.service to autostart Node-RED at every boot  
Use sudo systemctl disable nodered.service to disable autostart on boot

To find more nodes and example flows - go to [http://flows.nodered.org](http://flows.nodered.org)

# Starting as root systemd service. Started Node-RED graphical event wiring tool. 4 Feb 17:47:02 - [info] Willkommen bei Node-RED!

## 4 Feb 17:47:02 - [info] Node-RED Version: v1.2.6 4 Feb 17:47:02 - [info] Node.js Version: v12.20.1 4 Feb 17:47:02 - [info] Linux 4.19.108-v7+ arm LE 4 Feb 17:47:03 - [info] Paletten-Nodes werden geladen 4 Feb 17:47:10 - [info] [Dashboard] Started 4 Feb 17:47:10 - [info] Dashboard version 2.27.0 started at /ui 4 Feb 17:47:10 - [warn] ------------------------------------------------------ 4 Feb 17:47:10 - [warn] [node-red-node-pi-sense-hat/sensehat] Error: Can't find Sense HAT python libraries. Run sudo apt-get install sense-hat 4 Feb 17:47:10 - [warn] ------------------------------------------------------ 4 Feb 17:47:10 - [info] Einstellungsdatei: /root/.node-red/settings.js 4 Feb 17:47:10 - [info] Kontextspeicher: 'default' [module=memory] 4 Feb 17:47:10 - [info] Benutzerverzeichnis: /root/.node-red 4 Feb 17:47:10 - [warn] Projekte inaktiviert: editorTheme.projects.enabled=false 4 Feb 17:47:10 - [info] Flow-Datei: /root/.node-red/flows\_RaspberryPi3.json 4 Feb 17:47:10 - [info] Server wird jetzt auf ://127.0.0.1:1880/ ausgeführt. 4 Feb 17:47:11 - [warn]

## Die Datei mit den Datenflowberechtigungsnachweisen wird mit einem vom System generierten Schlüssel verschlüsselt. Wenn der vom System generierte Schlüssel aus irgendeinem Grund verloren geht, werden Ihre Berechtigungsnachweise Die Datei kann nicht wiederhergestellt werden. Sie müssen sie löschen und erneut eingeben. Ihre Berechtigungsnachweise. Sie sollten Ihren eigenen Schlüssel mit Hilfe der Option 'credentialSecret' in Ihre Einstellungsdatei. Node-RED wird dann Ihre Berechtigungsnachweise erneut verschlüsseln. Datei mit dem ausgewählten Schlüssel beim nächsten Deployen einer Änderung verwenden.

4 Feb 17:47:11 - [info] Flows starten  
4 Feb 17:47:13 - [info] Flows gestartet  
4 Feb 17:47:13 - [info] [mqtt-broker:Raspberry Pi] Verbindung zum Broker mqtt://localhost:1883 hergestellt.  
Built in 13.81s.

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<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [4 February 2021 16:53 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/4 "2021-02-04T16:53:42Z")

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> [@Gregor-Weissenborn](#):
>
> /root/.node-red/settings.js

That is generally not a good idea, though whether it has anything to do with the problem I don't know. Running as root means that an accidental mistake in the flow could wipe your system.  
Presumably you must have run the node-red installation script as root.

Have you tried clearing the browser cache? I should have suggested that last time.

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<div class="post-metadata">

**Author:** ![Gregor-Weissenborn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gregor-weissenborn/32/36508_2.png) [@Gregor-Weissenborn](https://discourse.nodered.org/u/Gregor-Weissenborn)\
**Post date:** [4 February 2021 16:59 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/5 "2021-02-04T16:59:02Z")

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Yes emptied the cache and reloaded Ctrl+Shift+R.  
No effect.  
And it ran root all the time.  
It seems that all the POST requests fail.

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<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [4 February 2021 17:23 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/6 "2021-02-04T17:23:00Z")

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If you temporarily move the flows file away and restart node-red then it will create a new empty flow. Having done that can you then add a ui node and open the dashboard ok?

Edit, just thought of something else. When you say you updated, what was it that you did?

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<div class="post-metadata">

**Author:** ![Gregor-Weissenborn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gregor-weissenborn/32/36508_2.png) [@Gregor-Weissenborn](https://discourse.nodered.org/u/Gregor-Weissenborn)\
**Post date:** [4 February 2021 17:33 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/7 "2021-02-04T17:33:30Z")

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Tried that.  
Removed the flows.  
(BTW: Last node can't be deleted. You have to create a new empty one to delete the remaining other one)  
Deployed  
`node-red-stop`  
`node-red-start`  
Added uinode  
Deployed  
Reloded dashbord.  
Same result.

I had made:  
apt-get update  
apt-get upgrade  
shutdown -r now

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<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [4 February 2021 18:02 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/8 "2021-02-04T18:02:07Z")

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> [@Gregor-Weissenborn](#):
>
> Last node can't be deleted

That isn't what I suggested. Move the flows file away and restart node red.

If that doesn't help move the whole `.node-red` folder away. And restart node red.

Did you install node red using the recommended script from the docs?

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<div class="post-metadata">

**Author:** ![Gregor-Weissenborn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gregor-weissenborn/32/36508_2.png) [@Gregor-Weissenborn](https://discourse.nodered.org/u/Gregor-Weissenborn)\
**Post date:** [5 February 2021 08:29 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/9 "2021-02-05T08:29:21Z")

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Hello Colin,

everything is running well again. - Thank very much you for your help!

Deleting the flow files (in /root/.node-red) did not help.

But deleting the whole .node-red folder helped.  
Even that caused me to reinstall all the palette nodes, reconfigure some config nodes, and reconfigure the dashboard theme.

But that was the way that brought the dashboard back to life.  
(No plan what in the update/upgrade of my Raspberry Pi caused the Dashboard to be unstable.)

Thanks again!

Regards  
Gregor

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<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [5 February 2021 11:12 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/10 "2021-02-05T11:12:19Z")

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> [@Gregor-Weissenborn](#):
>
> what in the update/upgrade of my Raspberry Pi caused the Dashboard to be unstable.

What does this command give?  
`apt policy nodejs`

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<div class="post-metadata">

**Author:** ![Gregor-Weissenborn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gregor-weissenborn/32/36508_2.png) [@Gregor-Weissenborn](https://discourse.nodered.org/u/Gregor-Weissenborn)\
**Post date:** [5 February 2021 11:15 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/11 "2021-02-05T11:15:47Z")

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root@RaspberryPi3:~# apt policy nodejs  
nodejs:  
Installiert: 12.20.1-1nodesource1  
Installationskandidat: 12.20.1-1nodesource1  
Versionstabelle:  
\*\*\* 12.20.1-1nodesource1 500  
500 ://deb.nodesource.com/node\_12.x stretch/main armhf Packages  
100 /var/lib/dpkg/status  
8.11.1~dfsg-2~bpo9+1 500  
500 ://archive.raspberrypi.org/debian stretch/main armhf Packages  
4.8.2~dfsg-1 500  
500 [http://raspbian.raspberrypi.org/raspbian](http://raspbian.raspberrypi.org/raspbian) stretch/main armhf Packages

Had to edit the links because of "new user rule -\> Only one link per post."

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<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [5 February 2021 11:35 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/12 "2021-02-05T11:35:24Z")

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That looks ok, I wanted to check where nodejs was installed from, in case your update and upgrade changed the major version. But assuming you didn't change anything else then I don't think it is that which caused the problem.

You could have saved some effort by copying the package.json from the original .node-red and running  
`npm install`  
which would have installed everything you had installed.  
It would be interesting to compare the new package.json with the old to see if there are any differences. The order in there does not matter.

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<div class="post-metadata">

**Author:** ![Gregor-Weissenborn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gregor-weissenborn/32/36508_2.png) [@Gregor-Weissenborn](https://discourse.nodered.org/u/Gregor-Weissenborn)\
**Post date:** [5 February 2021 11:55 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/13 "2021-02-05T11:55:49Z")

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Next time then. 🙂

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<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [5 February 2021 12:12 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/14 "2021-02-05T12:12:22Z")

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Are you able to compare the package.json files?

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<div class="post-metadata">

**Author:** ![Gregor-Weissenborn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gregor-weissenborn/32/36508_2.png) [@Gregor-Weissenborn](https://discourse.nodered.org/u/Gregor-Weissenborn)\
**Post date:** [5 February 2021 15:16 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/15 "2021-02-05T15:16:38Z")

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I had deleted the .node-red folder without saving it. So I don't have the package.json file to compare it.  
Next time then. 🙂

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<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [5 February 2021 15:43 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/16 "2021-02-05T15:43:13Z")

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That is a pity, it would have been good to understand what is going on for when someone else has a similar problem. It is difficult to do forensic analysis once the evidence has been destroyed.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [7 March 2021 15:43 UTC](https://discourse.nodered.org/t/updated-raspberry-pi-now-dashboard-polling-xhr-js-post-404/40386/17 "2021-03-07T15:43:51Z")

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