B.16. Unable to connect to server at 'host:16509': Connection refused ... error: failed to connect to the hypervisor

Symptom

While libvirtd should listen on TCP ports for connections, the connections fail:

virsh -c qemu+tcp://host/system
error: unable to connect to server at 'host:16509': Connection refused
error: failed to connect to the hypervisor

# virsh -c qemu+tcp://host/system
error: unable to connect to server at 'host:16509': Connection refused
error: failed to connect to the hypervisor

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The libvirt daemon is not listening on TCP ports even after changing configuration in /etc/libvirt/libvirtd.conf:

grep listen_ /etc/libvirt/libvirtd.conf
listen_tls = 1
listen_tcp = 1
listen_addr = "0.0.0.0"

# grep listen_ /etc/libvirt/libvirtd.conf
listen_tls = 1
listen_tcp = 1
listen_addr = "0.0.0.0"

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However, the TCP ports for libvirt are still not open after changing configuration:

netstat -lntp | grep libvirtd
#

# netstat -lntp | grep libvirtd
#

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Investigation

The libvirt daemon was started without the --listen option. Verify this by running this command:

ps aux | grep libvirtd
root     27314  0.0  0.0 1000920 18304 ?       Sl   Feb16   1:19 libvirtd --daemon

# ps aux | grep libvirtd
root     27314  0.0  0.0 1000920 18304 ?       Sl   Feb16   1:19 libvirtd --daemon

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The output does not contain the --listen option.

Solution

Start the daemon with the --listen option.

To do this, modify the /etc/sysconfig/libvirtd file and uncomment the following line:

#LIBVIRTD_ARGS="--listen"

#LIBVIRTD_ARGS="--listen"

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Then restart the libvirtd service with this command:

/etc/init.d/libvirtd restart

# /etc/init.d/libvirtd restart

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