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Sorry to hear youāre facing problems. 
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Getting help
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- Official documentation (searchable and regularly updated)
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Some or all of the below information will be requested if it isnāt supplied; for fastest response please provide as much as you can. 
The Basics
- Nextcloud Server version (e.g., 29.x.x):
- 31.0.9
- Operating system and version (e.g., Ubuntu 24.04):
- Linux 6.6.87.2-microsoft-standard-WSL2 x86_64
- Web server and version (e.g, Apache 2.4.25):
2.4.65
- Reverse proxy and version _(e.g. nginx 1.27.2)
NA
- PHP version (e.g, 8.3):
- 8.3.26
- Is this the first time youāve seen this error? (Yes / No):
Yes
- When did this problem seem to first start?
On Install
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
AIO, Docker Deskop, Windows
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
No
Summary of the issue you are facing:
Logs record 127.0.0.1 on failed remote login. It also produces another error related to brute-force training which my research appears to say itās related to duplicate 127.0.0.1 entries, but Iām not 100% if they are related.
I suspect none of the protection systems (brute-force,suspicious log-in, or fail2ban will work this problem in place.
Steps to replicate it (hint: details matter!):
- Simply fail a log in.
Log entries
Nextcloud
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.
[no app in context] Warning: Login failed: Admin disabled (Remote IP: 127.0.0.1)
POST /login
from 127.0.0.1 by -- at Oct 31, 2025, 6:39:08 AM
[suspicious_login] Error: Caught unknown error during IPv4 background training
from ? by -- at Oct 30, 2025, 6:25:00 PM
[no app in context] Warning: Login failed: admin disabled (Remote IP: 127.0.0.1)
POST /login
from 127.0.0.1 by -- at Oct 30, 2025, 6:18:35 PM
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.
NA
Web server / Reverse Proxy
The output of your Apache/nginx/system log in /var/log/____:
2025-10-31 06:45:31
Waiting for Nextcloud to start...
2025-10-31 06:45:37
Waiting for Nextcloud to start...
2025-10-31 06:45:42
Waiting for Nextcloud to start...
2025-10-31 06:45:47
Waiting for Nextcloud to start...
2025-10-31 06:45:52
Waiting for Nextcloud to start...
2025-10-31 06:45:57
Waiting for Nextcloud to start...
2025-10-31 06:46:02
Waiting for Nextcloud to start...
2025-10-31 06:46:07
Waiting for Nextcloud to start...
2025-10-31 06:46:12
Waiting for Nextcloud to start...
2025-10-31 06:46:17
Waiting for Nextcloud to start...
2025-10-31 06:46:22
Connection to nextcloud-aio-nextcloud (172.19.0.9) 9000 port [tcp/*] succeeded!
2025-10-31 06:46:22
/usr/lib/python3.12/site-packages/supervisor/options.py:13: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html.ā The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
2025-10-31 06:46:22
import pkg_resources
2025-10-31 06:46:23
{"level":"info","ts":1761907583.9168868,"msg":"maxprocs: Leaving GOMAXPROCS=4: CPU quota undefined"}
2025-10-31 06:46:23
{"level":"info","ts":1761907583.9171436,"msg":"GOMEMLIMIT is updated","package":"github.com/KimMachineGun/automemlimit/memlimit","GOMEMLIMIT":7496176435,"previous":9223372036854775807}
2025-10-31 06:46:23
{"level":"info","ts":1761907583.9171758,"msg":"using config from file","file":"/tmp/Caddyfile"}
2025-10-31 06:46:23
{"level":"info","ts":1761907583.925758,"msg":"adapted config to JSON","adapter":"caddyfile"}
2025-10-31 06:46:23
[Fri Oct 31 06:46:23.934104 2025] [mpm_event:notice] [pid 63:tid 63] AH00489: Apache/2.4.65 (Unix) configured -- resuming normal operations
2025-10-31 06:46:23
[Fri Oct 31 06:46:23.934222 2025] [core:notice] [pid 63:tid 63] AH00094: Command line: '/usr/local/apache2/bin/httpd -D FOREGROUND'
2025-10-31 06:46:23
{"level":"info","ts":1761907583.9806254,"msg":"failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 7168 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizesā for details."}
2025-10-31 06:46:23
{"level":"info","ts":1761907583.9934454,"msg":"serving initial configuration"}
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!):
Not sure how to retrieve that information.