> For the complete documentation index, see [llms.txt](https://platform9.com/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://platform9.com/kb/pmo/solution/libvirt-service-fails-to-start-with-error-cannot-read-ca-certif.md).

# Libvirt Service Fails to Start With Error "Cannot Read CA Certificate

## Problem

The ***pf9-ostackhost*** service is down because dependent ***libvirtd*** service refuses to start with error "Cannot read CA certificate: No such file or directory".

{% tabs %}
{% tab title="log" %}

```java
libvirtd: 6368: error : virNetTLSContextCheckCertFile:112 : Cannot read CA certificate '/etc/pf9/certs/libvirt/cacert.pem': No such file or directory
```

{% endtab %}
{% endtabs %}

## Environment

* Platform9 Managed OpenStack - v3.6.0 and Higher
* Nova
* Libvirt

## Cause

Libvirt is configured to look for a CA certificate by default and use it to establish a TLS/SSL connection. If the correct certificate is not configured or is missing or is not applicable then ***libvirtd*** refuses to start with an error about the CA certificate.

## Resolution

1. Open the file */etc/libvirt/libvirtd.conf* with a text editor and make the following changes.

{% tabs %}
{% tab title="Values" %}

```bash
listen_tcp=1
listen_tls=0
auth_tcp="none"
tcp_port="16509"
```

{% endtab %}
{% endtabs %}

2. Start the ***libvirtd*** service.

{% tabs %}
{% tab title="Command" %}

```none
# systemctl start libvirtd.service
```

{% endtab %}
{% endtabs %}

3. Start the ***pf9-ostackhost*** service.

{% tabs %}
{% tab title="Command" %}

```none
# systemctl start pf9-ostackhost.service
```

{% endtab %}
{% endtabs %}

4. If the ***libvirtd*** service still does not start, please contact [Platform9 Support](http://support.pf9.io) for further assistance.


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