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# Known Issues
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## Too many open files
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### Single-User Installation
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Nix can open a lot of files when fetching things for `/nix/store` which can cause
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```
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Too many open files"
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```
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The temporary way to fix this is set a new limit for current session using `ulimit` :
```sh
ulimit -n 131072
```
To increase limit permanently system-wide edit `/etc/sysctl.conf` :
```
fs.file-max = 131072
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```
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And use `sudo sysctl --system` to load these new settings.
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### Multi-User Installation
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The other reason why this error could appear are limits fo `nix-daemon` service:
https://github.com/NixOS/nix/issues/6007
Since Systemd services ignore system-wide limits you will have to add the following line:
```
LimitNOFILE=4096:1048576
```
To the `/etc/systemd/system/nix-daemon.service` service definition.
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## Cache Downloads Timing Out
If copying from Nix Cache times out you can adjust the timeout by changing [`nix/nix.conf` ](/nix/nix.conf ):
```conf
stalled-download-timeout = 9001
```
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## NDK Bundle Download Failures
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There is a known issue([#11111](https://github.com/status-im/status-mobile/issues/11111)) where the fetching of Android NDK Bundle from our own cache host fails in various different ways:
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```
unable to download 'https://nix-cache.status.im/nar/64g5wharwjj040rg1v8jnc5qhv1hkgds.nar':
HTTP error 200 (curl error: Stream error in the HTTP/2 framing layer)
```
```
unable to download 'https://nix-cache.status.im/nar/64g5wharwjj040rg1v8jnc5qhv1hkgds.nar':
HTTP error 200 (curl error: Transferred a partial file)
```
```
NAR for '/nix/store/psx79cnz1khfjlzkw3j8x9sb1jhk1v1a-ndk-bundle-21.0.6113669' fetched from 'https://nix-cache.status.im' is incomplete
```
Currently the simplest temporary solution is to edit `nix/nix.conf` and comment out the `extra-substituters` line.
This should allow Nix to download the NDK Bundle directly from Google servers rather than from our own cache.
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## `extra-sandbox-paths` Is a Restricted Setting
When building Android on NixOS you might encounter the following error:
```
ignoring the user-specified setting 'extra-sandbox-paths', because it is a restricted setting and you are not a trusted user
```
You can mitigate this by setting the [`nix.trustedUsers` ](https://nixos.org/nixos/options.html#nix.trustedusers ) property.
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## NixOS Prioritizes System Config
Currently on NixOS `NIX_CONF_DIR` is being ignored in favor of the default `/etc/nix/nix.conf` .
This will be possible to fix once Nix `2.4` comes out with support for `NIX_USER_CONF_FILES` .
For more details see https://github.com/NixOS/nix/issues/3723.
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## Extra Sandbox Files Not Available
It's possible that on a multi-user installation files provided to the build sandbox using the `extra-sandbox-paths` option will ne be available, unless the current user is added to `trusted-users` in `nix.conf` file.
Issues:
* https://github.com/NixOS/nix/issues/6115
* https://github.com/NixOS/nix/issues/6217
