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neko-custom/docs/getting-started/troubleshooting.md

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# Troubleshooting
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Neko UI loads, but you don't see the screen, and it gives you `connection timeout` or `disconnected` error?
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## Test your client
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Some browser may block WebRTC access by default. You can check if it is enabled by going to `about:webrtc` or `chrome://webrtc-internals` in your browser.
Check if your extensions are not blocking WebRTC access. For example, Privacy Badger or Private Internet Access blocks WebRTC by default.
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Test whether your client [supports](https://www.webrtc-experiment.com/DetectRTC/) and can [connect to WebRTC](https://www.webcasts.com/webrtc/).
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## Networking
Most problems are networking related.
### Check if your ports are correctly exposed using docker
Check that your ephemeral port range `NEKO_EPR` is correctly exposed as `/udp` port range.
In following example, specified range `52000-52100` must be also exposed using docker.
```diff
version: "3.4"
services:
neko:
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image: "m1k1o/neko:firefox"
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restart: "unless-stopped"
shm_size: "2gb"
ports:
- "8080:8080"
+ - "52000-52100:52000-52100/udp"
environment:
NEKO_SCREEN: 1920x1080@30
NEKO_PASSWORD: neko
NEKO_PASSWORD_ADMIN: admin
+ NEKO_EPR: 52000-52100
NEKO_ICELITE: 1
```
### Validate UDP ports reachability
Ensure, that your ports are reachable through your external IP.
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To validate UDP connection the simplest way, run this on your server:
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```shell
nc -ul 52101
```
And this on your local client:
```shell
nc -u [server ip] 52101
```
Then try to type on one end, you should see characters on the other side.
![nc command example](udp-ports-nc.png)
If it does not work for you, then most likely your port forwarding is not working correctly. Or your ISP is blocking traffic.
### Check if your external IP was determined correctly
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One of the first logs, when the server starts, writes down your external IP that will be sent to your clients to connect to.
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```shell
docker-compose logs neko | grep nat_ips
```
You should see this:
```
11:11AM INF webrtc starting ephemeral_port_range=52000-52100 ice_lite=true ice_servers="[{URLs:[stun:stun.l.google.com:19302] Username: Credential:<nil> CredentialType:password}]" module=webrtc nat_ips=<your-IP>
```
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If your IP is not correct, you can specify own IP resolver using `NEKO_IPFETCH`. It needs to return IP address that will be used.
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```diff
version: "3.4"
services:
neko:
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image: "m1k1o/neko:firefox"
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restart: "unless-stopped"
shm_size: "2gb"
ports:
- "8080:8080"
- "52000-52100:52000-52100/udp"
environment:
NEKO_SCREEN: 1920x1080@30
NEKO_PASSWORD: neko
NEKO_PASSWORD_ADMIN: admin
NEKO_EPR: 52000-52100
NEKO_ICELITE: 1
+ NEKO_IPFETCH: https://ifconfig.co/ip
```
Or you can specify your IP address manually using `NEKO_NAT1TO1`: (It's read as NAT 1 to 1, so it's capital letter 'O', not zero '0', in NAT1`TO`1)
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```diff
version: "3.4"
services:
neko:
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image: "m1k1o/neko:firefox"
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restart: "unless-stopped"
shm_size: "2gb"
ports:
- "8080:8080"
- "52000-52100:52000-52100/udp"
environment:
NEKO_SCREEN: 1920x1080@30
NEKO_PASSWORD: neko
NEKO_PASSWORD_ADMIN: admin
NEKO_EPR: 52000-52100
NEKO_ICELITE: 1
+ NEKO_NAT1TO1: <your-IP>
```
If you want to use n.eko only locally, you must put here your local IP address, otherwise public address will be used.
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### Neko works externally, but not locally
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You are probably missing NAT Loopback (NAT Hairpinning) setting on your router.
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Example for pfsense with truecharts docker container:
- First, port forward the relevant ports 8080 and 52000-52100/udp for the container.
- Then turn on `Pure NAT` pfsense (under system > advanced > firewall and nat).
- Make sure to check the two boxes so it works.
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- Make sure `NEKO_NAT1TO1` is blank and `NEKO_IPFETCH` address is working correctly (if unset default value is chosen).
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- Test externally to confirm it works.
- Internally you have to access it using `<your-public-ip>:port`
If your router does not support NAT Loopback (NAT Hairpinning), you can use turn servers to overcome this issue. See [more details here](https://neko.m1k1o.net/#/getting-started/?id=networking) on how to setup local coturn instance.
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### Neko works locally, but not externally
Make sure, that you are exposing your ports correctly.
If you put local ip as `NEKO_NAT1TO1`, external clients try to connect to that ip. But it is unreachable for them, because it is your local IP. You must use your public IP address with port forwarding.
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## Debug mode
To see verbose information from n.eko server, you can enable debug mode using `NEKO_DEBUG`.
```diff
version: "3.4"
services:
neko:
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image: "m1k1o/neko:firefox"
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restart: "unless-stopped"
shm_size: "2gb"
ports:
- "8080:8080"
- "52000-52100:52000-52100/udp"
environment:
NEKO_SCREEN: 1920x1080@30
NEKO_PASSWORD: neko
NEKO_PASSWORD_ADMIN: admin
NEKO_EPR: 52000-52100
NEKO_ICELITE: 1
+ NEKO_DEBUG: 1
```
Ensure, that you have enabled debug mode in javascript console too, in order to see verbose information from client.
## Frequently Encountered Errors
### Common server errors
```
WRN session created with and error error="invalid 1:1 NAT IP mapping"
```
Check your `NEKO_NAT1TO1` or ensure, that `NEKO_IPFETCH` returns correct IP.
---
```
WRN could not get server reflexive address udp6 stun:stun.l.google.com:19302: write udp6 [::]:52042->[2607:f8b0:4001:c1a::7f]:19302: sendto: cannot assign requested address
```
Check if your DNS is set up correctly, and if your IPv6 connectivity is working properly, or is disabled.
---
```
WRN undeclaredMediaProcessor failed to open SrtcpSession: the DTLS transport has not started yet module=webrtc subsystem=
```
Check if your UDP ports are exposed correctly and reachable.
### Common client errors
```
Firefox cant establish a connection to the server at ws://<your-IP>/ws?password=neko.
```
Check if your TCP port is exposed correctly and your reverse proxy is correctly proxying websocket connections. And if your browser has not disabled websocket connections.
---
```
Getting black screen with a cursor, but no browser.
```
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Most likely you forgot to add `-cap-add=SYS_ADMIN` when using chromium-based browsers.
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### Unrelated server errors
```
[ERROR:bus.cc(393)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix")
```
This error originates from browser, that it could not connect to dbus. This does not affect us and can be ignored.
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### Broadcast pipeline not working with some ingest servers
See [related issue](https://github.com/m1k1o/neko/issues/276).
```
Could not connect to RTMP stream "'rtmp://<ingest-url>/live/<stream-key-removed> live=1'" for writing
```
Some ingest servers require `live=1` parameter in the URL (e.g. nginx-rtmp-module). Some do not and do not accept aphostrophes (e.g. owncast). You can try to change the pipeline to:
```yaml
NEKO_BROADCAST_PIPELINE: "flvmux name=mux ! rtmpsink location={url} pulsesrc device={device} ! audio/x-raw,channels=2 ! audioconvert ! voaacenc ! mux. ximagesrc display-name={display} show-pointer=false use-damage=false ! video/x-raw,framerate=28/1 ! videoconvert ! queue ! x264enc bframes=0 key-int-max=0 byte-stream=true tune=zerolatency speed-preset=veryfast ! mux."
```