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Description of problem:
When setting keepalive_required=1, libvirtd will refuse all the clients even if the client supports keepalive.

Version-Release number of selected component :
libvirt-1.2.17-2.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Set keepalive_required=1 in libvirtd.conf on host A, restart libvirtd service.

2.Connect to the libvirtd of host A:
# virsh -c qemu+tcp://10.66.6.6/system
error: failed to connect to the hypervisor
error: operation failed: keepalive support is required to connect


Actual results:
As step2, libvirtd refused the client connection.

Expected results:
As virsh client supports replying for server keepalives, it should connect successfully.

Patch proposed upstream:

https://www.redhat.com/archives/libvir-list/2015-July/msg00738.html

Fixed upstream by v1.2.18-61-ga8743c39389b:

commit a8743c39389b76897811f60dcd8485cd51d76f02
Author: Martin Kletzander <mkletzan>
Date:   Mon Jul 20 14:51:24 2015 +0200

    rpc: Remove keepalive_required option

Verify this bug with libvirt-1.2.17-6.el7, could found the clear explanation that the keepalive_required option has been removed in libvirtd.conf, also found the corresponding code has been disabled, so we could verify this bug right now. 

# These configuration options are no longer used.  There is no way to
# restrict such clients from connecting since they first need to
# connect in order to ask for keepalive.
#
#keepalive_required = 1
#admin_keepalive_required = 1

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2202.html