Access to Nextcloud-AIO only from PC that installed it possible, other devices only from outside network

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The Basics

  • Nextcloud Server version (e.g., 29.x.x):
    • 32.0.0.0
  • Operating system and version (e.g., Ubuntu 24.04):
    • Linux 6.12.47+rpt-rpi-2712 aarch64
  • Web server and version (e.g, Apache 2.4.25):
    • replace me
  • Reverse proxy and version _(e.g. nginx 1.27.2)
    • replace me
  • PHP version (e.g, 8.3):
    • 8.3.25
  • Is this the first time you’ve seen this error? (Yes / No):
    • no
  • When did this problem seem to first start?
    • three weeks ago
  • Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
    • AIO Docker
  • Are you using CloudfIare, mod_security, or similar? (Yes / No)
    • no

Summary of the issue you are facing:

I installed nextcloud on my RPI5 via my laptop, configured a myfritz dynamic dns and can access nextcloud great from that pc (browser and Nextcloud windows app).

However, all other devices (windows pc, android mobile) cannot access nextcloud when connected to the local network.

It´s only the device that installed nextcloud (via browser on my RPI5) that has access.

All other devices point to my routers login page.

These same devices can connect to Nextcloud when not connected to the local network ie external access via mobiles network or other networks.

Steps to replicate it (hint: details matter!):

  1. Install Nextcloud AIO Docker on RPI 5

  2. configure port forwarding in Fritzbox, add DNS rebind exception for xxxx.myfritz.link

  3. call xxxx.myfritz.link address from other pc´s webbrowser or mobile device

  4. receive certificate warning, then forward to routers admin page

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 log entry is generated

2

Calling xxxx.myfritz.link:8080 sends me to this page:

image
image780×530 25.7 KB

3

As a troubleshooting step, what happens if you go to https://local-IPaddress from one of the LAN computers? If that is able to connect:

Have you looked into setting up a DNS entry on your router or other local resolver like a pihole, which specifies that xxxx.myfritz.link refers to local-IPaddress ? Then whenever a computer on your local network uses your router’s DNS, it should find your local IP address. Please note that with modern browsers, you may need to disable DNS over HTTPS (DoH) or make an exception for myfritz.link. This technique is known as Split-DNS.

I am not a networking expert (nexpert?) but hopefully this helps.

–Trees

1 Like
4

Thanks, I did some digging and found this out:
https://local-IPaddress > I get “ERR_SSL_PROTOCOL_ERROR”

The PC that works gives only an IPv4 address when quering ipconfig, the other devices come back with IPv6 addresses.

I tracert to xxxx.myfritz.link and get an IPv6 address from the pc that doesn´t work and an IPv4 address from the PC that does work.

Now i switched off IPv6 support in my router and now it works, I can access nextcloud from all the PC´s using IPv4.

It´s not ideal, how can I find out where the issue is on IPv6?

5

First of all have a look into the logs (router, webserver).

In the FritzBox you also will need to add the IPv6 address of your Nextcloud host’s IPv6 address in the port-forwarding.
The Nextcloud host needs a manually assigned IPv6 IP address as well as done with IPv4.

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