# Error messages in nextcloud log

**URL:** <https://forum.collaboraonline.com/t/error-messages-in-nextcloud-log/4104>\
**Category:** User Support\
**Created:** [November 9, 2025, 4:29pm UTC](https://forum.collaboraonline.com/t/error-messages-in-nextcloud-log/4104 "2025-11-09T16:29:21Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![gusto](https://avatars.discourse-cdn.com/v4/letter/g/51bf81/32.png) [@gusto](https://forum.collaboraonline.com/u/gusto)\
**Post date:** [November 9, 2025, 4:29pm UTC](https://forum.collaboraonline.com/t/error-messages-in-nextcloud-log/4104/1 "2025-11-09T16:29:21Z")

</div>

I struggled for about 3 days until I installed and ran nextcloud 32 and COOLWSD 25.04.7.1 on private subdomains behind a reverse proxy server.  
Now everything seems to work (documents open in nextcloud and I can edit them).  
However, I have a lot of these entries in the nextcloud log. Every time I open an office document, a new error appears in the log. However, I cannot say that the error message only occurs after opening an office document.

All errors are caused by the richdocuments application

```auto
{"reqId":"UPPS6pZwh9EyEW6tmJmK","level":3,"time":"2025-11-09T15:27:43+00:00","remoteAddr":"10.10.8.3","user":"admin","app":"richdocuments","method":"GET","url":"/index.php/core/preview?fileId=58&x=32&y=32&mimeFallback=true&v=0220e2&a=0","message":"Failed to convert preview: Client error: `POST https://collabora.example.com/cool/convert-to/png` resulted in a `413 Request Entity Too Large` response:\n<html>\r\n<head><title>413 Request Entity Too Large</title></head>\r\n<body>\r\n<center><h1>413 Request Entity Too Large</h1>< (truncated...)\n","userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36","version":"32.0.1.2","exception":{"Exception":"GuzzleHttp\\Exception\\ClientException","Message":"Client error: `POST https://collabora.example.com/cool/convert-to/png` resulted in a `413 Request Entity Too Large` response:\n<html>\r\n<head><title>413 Request Entity Too Large</title></head>\r\n<body>\r\n<center><h1>413 Request Entity Too Large</h1>< (truncated...)\n","Code":413,"Trace":[{"file":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":72,"function":"create","class":"GuzzleHttp\\Exception\\RequestException","type":"::","args":[" ***sensitive parameters replaced***"]},{"file":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/promises/src/Promise.php","line":209,"function":"{closure:{closure:{closure:GuzzleHttp\\Middleware::httpErrors():60}:61}:67}","class":"GuzzleHttp\\Middleware","type":"::","args":[" ***sensitive parameters replaced***"]},{"file":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/promises/src/Promise.php","line":158,"function":"callHandler","class":"GuzzleHttp\\Promise\\Promise","type":"::"},{"file":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/promises/src/TaskQueue.php","line":52,"function":"{closure:GuzzleHttp\\Promise\\Promise::settle():156}","class":"GuzzleHttp\\Promise\\Promise","type":"::","args":[" ***sensitive parameters replaced***"]},{"file":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/promises/src/Promise.php","line":251,"function":"run","class":"GuzzleHttp\\Promise\\TaskQueue","type":"->"},{"file":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/promises/src/Promise.php","line":227,"function":"invokeWaitFn","class":"GuzzleHttp\\Promise\\Promise","type":"->"},{"file":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/promises/src/Promise.php","line":272,"function":"waitIfPending","class":"GuzzleHttp\\Promise\\Promise","type":"->"},{"file":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/promises/src/Promise.php","line":229,"function":"invokeWaitList","class":"GuzzleHttp\\Promise\\Promise","type":"->"},{"file":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/promises/src/Promise.php","line":69,"function":"waitIfPending","class":"GuzzleHttp\\Promise\\Promise","type":"->"},{"file":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/guzzle/src/Client.php","line":189,"function":"wait","class":"GuzzleHttp\\Promise\\Promise","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/Http/Client/Client.php","line":277,"function":"request","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/html/nextcloud.example.com/apps/richdocuments/lib/Service/RemoteService.php","line":94,"function":"post","class":"OC\\Http\\Client\\Client","type":"->","args":[" ***sensitive parameters replaced***"]},{"file":"/var/www/html/nextcloud.example.com/apps/richdocuments/lib/Service/RemoteService.php","line":68,"function":"convertTo","class":"OCA\\Richdocuments\\Service\\RemoteService","type":"->"},{"file":"/var/www/html/nextcloud.example.com/apps/richdocuments/lib/Preview/Office.php","line":43,"function":"convertFileTo","class":"OCA\\Richdocuments\\Service\\RemoteService","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/Preview/GeneratorHelper.php","line":45,"function":"getThumbnail","class":"OCA\\Richdocuments\\Preview\\Office","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/Preview/Generator.php","line":342,"function":"getThumbnail","class":"OC\\Preview\\GeneratorHelper","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/Preview/Generator.php","line":313,"function":"generateProviderPreview","class":"OC\\Preview\\Generator","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/Preview/Generator.php","line":117,"function":"getMaxPreview","class":"OC\\Preview\\Generator","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/Preview/Generator.php","line":87,"function":"generatePreviews","class":"OC\\Preview\\Generator","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/PreviewManager.php","line":161,"function":"getPreview","class":"OC\\Preview\\Generator","type":"->"},{"file":"/var/www/html/nextcloud.example.com/core/Controller/PreviewController.php","line":166,"function":"getPreview","class":"OC\\PreviewManager","type":"->"},{"file":"/var/www/html/nextcloud.example.com/core/Controller/PreviewController.php","line":128,"function":"fetchPreview","class":"OC\\Core\\Controller\\PreviewController","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/AppFramework/Http/Dispatcher.php","line":204,"function":"getPreviewByFileId","class":"OC\\Core\\Controller\\PreviewController","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/AppFramework/Http/Dispatcher.php","line":118,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/AppFramework/App.php","line":153,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud.example.com/lib/private/Route/Router.php","line":321,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/nextcloud.example.com/lib/base.php","line":1061,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/nextcloud.example.com/index.php","line":25,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/nextcloud.example.com/3rdparty/guzzlehttp/guzzle/src/Exception/RequestException.php","Line":111,"message":"Failed to convert preview: Client error: `POST https://collabora.example.com/cool/convert-to/png` resulted in a `413 Request Entity Too Large` response:\n<html>\r\n<head><title>413 Request Entity Too Large</title></head>\r\n<body>\r\n<center><h1>413 Request Entity Too Large</h1>< (truncated...)\n","exception":{},"CustomMessage":"Failed to convert preview: Client error: `POST https://collabora.example.com/cool/convert-to/png` resulted in a `413 Request Entity Too Large` response:\n<html>\r\n<head><title>413 Request Entity Too Large</title></head>\r\n<body>\r\n<center><h1>413 Request Entity Too Large</h1>< (truncated...)\n"}}

```

 ![error](https://europe1.discourse-cdn.com/flex013/uploads/collaboraonline/original/2X/d/d8a4f61b5a09cc60039dffe158f0926f5994e42a.png)

---

<div class="post-metadata">

**Author:** ![darshan](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.collaboraonline.com/darshan/32/2230_2.png) [@darshan](https://forum.collaboraonline.com/u/darshan)\
**Post date:** [November 10, 2025, 4:09am UTC](https://forum.collaboraonline.com/t/error-messages-in-nextcloud-log/4104/2 "2025-11-10T04:09:02Z")

</div>

hii @gusto

Your log clearly shows that **Nextcloud’s richdocuments app** is trying to generate a **preview thumbnail** for an Office document by calling Collabora’s `/cool/convert-to/png` endpoint, but the request is **too large for your reverse proxy or Collabora front-end to accept** , leading to `413 Request Entity Too Large`.

### Root cause

This is **not** a problem in Nextcloud or Collabora themselves, but in your **reverse proxy configuration** (for example Nginx, Apache, or Traefik) — the body size limit for uploads is too small, so when Nextcloud sends the document to Collabora for preview generation, it gets rejected.

### Fix

Increase the maximum allowed request body size for your Collabora subdomain.

Thanks  
Darshan

---

<div class="post-metadata">

**Author:** ![gusto](https://avatars.discourse-cdn.com/v4/letter/g/51bf81/32.png) [@gusto](https://forum.collaboraonline.com/u/gusto)\
**Post date:** [November 10, 2025, 4:38pm UTC](https://forum.collaboraonline.com/t/error-messages-in-nextcloud-log/4104/3 "2025-11-10T16:38:43Z")

</div>

I had it set in the server block (nginx) for collabora, but apparently it didn’t apply, so I set this value  
`client_max_body_size 512;`  
globally in

`/etc/nginx/nginx.conf`

Now it works great and the errors are no longer displayed.

I’m curious about one more thing (see picture).  
My server is not very powerful  
LXC RAM 2GB and 2 CPU cores  
Should I increase the performance of LXC (e.g. 4 cores and 4GB RAM)?

Very thanks

 ![server-audit](https://europe1.discourse-cdn.com/flex013/uploads/collaboraonline/original/2X/f/fe89184de36227706c7a0cb9261295a48b8da018.png)

---

<div class="post-metadata">

**Author:** ![darshan](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.collaboraonline.com/darshan/32/2230_2.png) [@darshan](https://forum.collaboraonline.com/u/darshan)\
**Post date:** [November 12, 2025, 10:26am UTC](https://forum.collaboraonline.com/t/error-messages-in-nextcloud-log/4104/4 "2025-11-12T10:26:12Z")

</div>

@gusto

You fixed it right.

Your LXC (2 GB RAM, 2 CPU) is fine for 1–2 users.  
For smoother performance: upgrade to **4 GB RAM + 4 CPU** , or run:

| Usage | CPUs | RAM | Notes |
| --- | --- | --- | --- |
| 1–3 concurrent users | 2 | 2 GB | Works, but may swap or lag with large docs or Impress files |
| 4–10 concurrent users | 4 | 4 GB | Smooth editing, faster startup |
| 10+ active users | 4–8 | 6–8 GB+ | Required for real-time collaboration and previews |

I found this nice little thread check it once

> **[System requirements for Collabora Online](https://help.nextcloud.com/t/system-requirements-for-collabora-online/30694/2)**
>
> Even though docker handles most of the time resources pretty well, it uses around 1 GB of storage (CODE image) ~150 MB RAM on the first document open. ~50 MB of RAM on later documents I would suggest at least 2 GB of RAM. Or you might hit...

Thanks  
Darshan

---

<div class="post-metadata">

**Author:** ![gusto](https://avatars.discourse-cdn.com/v4/letter/g/51bf81/32.png) [@gusto](https://forum.collaboraonline.com/u/gusto)\
**Post date:** [November 13, 2025, 6:32am UTC](https://forum.collaboraonline.com/t/error-messages-in-nextcloud-log/4104/5 "2025-11-13T06:32:50Z")

</div>

In my case, no more than 4 clients will use collabora (or nextcloud).  
If the number of clients increases, I will also increase the resources for LXC.  
Thank you

---

<div class="post-metadata">

**Author:** ![darshan](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.collaboraonline.com/darshan/32/2230_2.png) [@darshan](https://forum.collaboraonline.com/u/darshan)\
**Post date:** [November 13, 2025, 7:11am UTC](https://forum.collaboraonline.com/t/error-messages-in-nextcloud-log/4104/6 "2025-11-13T07:11:05Z")

</div>

Your welcome @gusto

Regards,  
Darshan

---

<div class="post-metadata">

**Author:** ![darshan](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.collaboraonline.com/darshan/32/2230_2.png) [@darshan](https://forum.collaboraonline.com/u/darshan)\
**Post date:** [November 13, 2025, 7:11am UTC](https://forum.collaboraonline.com/t/error-messages-in-nextcloud-log/4104/7 "2025-11-13T07:11:30Z")

</div>