Getting hash errors while trying to hunt down connection issues

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I have been having a bunch of issues since I had an issue where I accidentally tried to copy a huge folder into another folder, then canceled it. Not sure if this is related, as I have reset/reinstalled NC. I thought reinstalling would fix my issue since I couldn’t sync anyway. Below (in the log section) are the issues I am getting now

The Basics

  • Nextcloud Server version (e.g., 29.x.x):
    • 31
  • Operating system and version (e.g., Ubuntu 24.04):
    • Ubuntu 24.04.2 LTS
  • Web server and version (e.g, Apache 2.4.25):
    • Apache 2.4.58
  • Reverse proxy and version _(e.g. nginx 1.27.2)
    • replace me
  • PHP version (e.g, 8.3):
    • 8.3.6

Please provide the log entries from your Nextcloud log that are generated during the time of problem (via the Copy raw option from Administration settings->Logging screen or from your nextcloud.log located in your data directory). Feel free to use a pastebin/gist service if necessary.

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:36:58 AM

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:36:58 AM

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:36:48 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:35:06 AM

Error
no app in context
BadRequest
Expected filesize of 9151852 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 1245184 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.

Sep 9, 2025, 11:31:31 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:30:44 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:27:42 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:16:16 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:13:10 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:10:04 AM

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:09:34 AM

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:09:14 AM

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:09:14 AM

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:09:14 AM

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:05:11 AM

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:04:50 AM

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:04:50 AM

Error
index
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 11:04:50 AM

Error
no app in context
BadRequest
Expected filesize of 3925215 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 1835008 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.

Sep 9, 2025, 11:03:50 AM

Error
no app in context
BadRequest
Expected filesize of 8823068 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 6553600 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.

Sep 9, 2025, 11:02:54 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 10:58:42 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 10:55:36 AM

Error
no app in context
BadRequest
Expected filesize of 93845 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 49152 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.

Sep 9, 2025, 10:53:34 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 10:46:19 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 10:42:10 AM

Error
no app in context
Exception
hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/html/nextcloud/lib/private/Security/Crypto.php' line 147

Sep 9, 2025, 10:35:43 AM

Web Browser

If the problem is related to the Web interface, open your browser inspector Console and Network tabs while refreshing (reloading) and reproducing the problem. Provide any relevant output/errors here that appear.

PASTE

Web server / Reverse Proxy

The output of your Apache/nginx/system log in /var/log/____:

PASTE HERE

Configuration

Nextcloud

The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):

PASTE HERE

Apps

The output of occ app:list (if possible).

Tips for increasing the likelihood of a response

  • Use the preformatted text formatting option in the editor for all log entries and configuration output.
  • If screenshots are useful, feel free to include them.
    • If possible, also include key error output in text form so it can be searched for.
  • Try to edit log output only minimally (if at all) so that it can be ran through analyzers / formatters by those trying to help you.
2

Not sure if this is related, as I have reset/reinstalled NC. I thought reinstalling would fix my issue since I couldn’t sync anyway. Below (in the log section) are the issues I am getting now

You’ll need to post the full stack trace from one of the log entries, as noted in the support template text.

The reset/reinstall could be related. For example, if you were using encryption if you didn’t migrate over the secret (such as if you dumped your config/config.php).

3

I have the nextcloud error logs from Aug. 1 to current here nextcloud error log 9/11 - Pastebin.com

4

Those appear to be your web server error logs, not contents of the Nextcloud log.

5

I put as much as i could here