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36.9. A missing localhost entry causes virt-manager to fail

The virt-manager application may fail to launch and display an error such as “Unable to open a connection to the Xen hypervisor/daemon”. This is usually caused by a missing localhost entry in the /etc/hosts file. Verify that you indeed have a localhost entry and if it is missing from /etc/hosts and insert a new entry for localhost if it is not present. An incorrect /etc/hosts may resemble the following:
# Do not remove the following line, or various programs
# that require network functionality will fail.
localhost.localdomain localhost
The correct entry should look similar to the following:
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               localhost.localdomain localhost
localhost.localdomain localhost