Problem with Cryptpad Letsencrypt certificate v2

jacobb · September 16, 2026, 10:59am

I have searched the forum for similar issues

on

This category is for general issues(=something is broken) regarding YunoHost, NOT apps.

on

This form is written in English but feel free to write in French if you’re more comfortable!

on

What type of hardware are you using

VPS bought online

What YunoHost version are you running

latest

How are you able to access your server

SSH

Are you in a special context or did you perform specific tweaking on your YunoHost instance ?

No

Describe your issue

After a fresh install of Yunohost and Cryptpad, I could not access cryptpad’s drive.
I solves that issue by following these instructions:

github.com/TestDesk/homelab-solutions

yunohost/apps/cryptpad/yh-cryptpad-sandbox-nginx.md

main

# CryptPad on YunoHost: Sandbox Domain nginx Fix

**Version:** May 2026  
**YunoHost:** 12.1.39 (stable)  
**CryptPad:** 2026.2.2 ~ynh1  
**Symptoms:** Certificate renewal fails, documents stuck on "Loading", backups fail

---

## Table of Contents

1. [Problem Description](#problem-description)
2. [Root Cause](#root-cause)
3. [Guide for Users](#guide-for-users)
4. [Technical Explanation for Developers](#technical-explanation-for-developers)

---

## Problem Description

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Taken from this thread here on the forum:

I have successfully followed step 1-6 but step 7 and onwards seem quite “dangerous” to my limited skills.

I would just like some to confirm that it is meaningful and safe to do it?

Share relevant logs or error messages

otm33 · September 16, 2026, 12:06pm

Did you follow these instructions :

github.com/YunoHost-Apps/cryptpad_ynh

doc/POST_INSTALL.md

master

## Sandbox domain

The application has created the `__SANDBOXDOMAIN__` domain in the server's NGINX configuration.
It is normal not to see it listed among the domains.
Its certificate management is linked to the main domain `__DOMAIN__`.

1. After installing the application, you need to configure your DNS records so that `__SANDBOXDOMAIN__` points to your server. A CNAME record would be enough, pointing to `__DOMAIN__`.
2. You need to force the regeneration of the certificates for `__DOMAIN__`. This will then be automatically done upon the certificate's end date.

## Administration

Once CryptPad is installed, create an account via the Register button on the home page. To grant this account administration rights:

1. Copy the public key found in User Menu (avatar at the top right) > Settings > Account > Public Signing Key
2. Paste this key in `__INSTALL_DIR__/config/config.js` in the following array (uncomment and replace the placeholder):
```
adminKeys: [
    "[cryptpad-user1@my.awesome.website/YZgXQxKR0Rcb6r6CmxHPdAGLVludrAF2lEnkbx1vVOo=]",
],
```

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?