---
layout: article
title: Troubleshooting
git: troubleshooting.md
---

## Test tones {#tones}

If you need to test your computer's soundcard, you can use `speaker-test`, a tone generator for ALSA.
This does not come installed with LibreTime but can be installed with `sudo apt install speaker-test`.

```
speaker-test [-D] [-f]

Where:
    -D device name
    -f frequency of test tone
```

The **airtime-test-stream** command enables you to send a test tone to a local or remote streaming media server. Press **Ctrl+C** on your keyboard to stop the tone being streamed.
```
airtime-test-stream [-v]
               [-o icecast | shoutcast ] [-H hostname] [-P port]
               [-u username] [-p password] [-m mount]
               [-h]
Where:
     -v verbose mode
     -o stream server type (default: icecast)
     -H hostname (default: localhost)
     -P port (default: 8000)
     -u user (default: source)
     -p password (default: hackme)
     -m mount (default: test)
     -h show help menu
```

## RabbitMQ hostname changes

If the Airtime logs indicate failures to connect to the RabbitMQ server, such as:
```
2013-10-31 08:21:11,255 ERROR - [pypomessagehandler.py : main() : line
99] - Error connecting to RabbitMQ Server. Trying again in few seconds

2013-10-31 08:21:11,255 ERROR - \[pypomessagehandler.py : main() : line 99\] - Error connecting to RabbitMQ Server. Trying again in few seconds - See more at: http://forum.sourcefabric.org/discussion/16050/\#sthash.W8OJrNFm.dpuf
```
but the RabbitMQ server is running normally, this error might be due to a change in the server's hostname since Libretime installation. Directory names under */var/lib/rabbitmq/mnesia/* indicate that RabbitMQ's database files are organised according to the hostname of the server (ex. `rabbit@airtime`) where the hostname is *airtime.example.com*. If the hostname has changed, it may be necessary to reconfigure RabbitMQ manually, as follows:

1. Delete the files in */var/lib/rabbitmq/mnesia/*

```
sudo rm -r /var/lib/rabbitmq/mnesia/*
```

2. Restart RabbitMQ:

```
sudo systemctl restart rabbitmq-server
```

3. Enter the following commands to set up authentication and grant permissions. The *rabbitmqctl add\_user* command requires the RabbitMQ password from the /etc/airtime/airtime.conf file as an argument. The *rabbitmqctl set\_permissions* command should be entered on one line, with the list of Airtime services repeated three times:

```
rabbitmqctl add_vhost /airtime
rabbitmqctl add_user airtime XXXXXXXXXXXXXXXXXXXX
rabbitmqctl set_permissions -p /airtime airtime
   "airtime-pypo|pypo-fetch|airtime-analyzer|media-monitor"
   "airtime-pypo|pypo-fetch|airtime-analyzer|media-monitor"
   "airtime-pypo|pypo-fetch|airtime-analyzer|media-monitor"
```