Unable to connect to libvirt

[onastvar]

Anyone know how to fix libvirt issue. I'm on El Capitan. All installed fine.

Unable to connect to libvirt.

An error occurred, but the cause is unknown

Verify that the 'libvirtd' daemon is running
on the remote host.

Libvirt URI is: qemu+ssh://root@server/system?socket=/var/run/libvirt/libvirt-sock

Traceback (most recent call last):
File "/usr/local/Cellar/virt-manager/1.4.0/libexec/share/virt-manager/virtManager/connection.py", line 904, in _do_open
self._backend.open(self.do_creds_password)
File "/usr/local/Cellar/virt-manager/1.4.0/libexec/share/virt-manager/virtinst/connection.py", line 148, in open
open_flags)
File "/usr/local/Cellar/virt-manager/1.4.0/libexec/vendor/lib/python2.7/site-packages/libvirt.py", line 105, in openAuth
if ret is None:raise libvirtError('virConnectOpenAuth() failed')
libvirtError: An error occurred, but the cause is unknown

[skshandilya]

any workarounds for this? I am connecting from 1.4 virt-manager to libvirt version 1.3.1

[btro]

I receive the same error like OP. My virt-manager --version: 1.4.0. Mac OS: 10.12.2 (16C67). My Linux machine can connect via the URI without any problem. I'm using public key auth with an imported identity and no password prompt is happening or is expected - maybe that is related?

[Sun, 25 Dec 2016 23:17:26 virt-manager 81838] DEBUG (engine:140) Initial gtkapplication activated
[Sun, 25 Dec 2016 23:17:26 virt-manager 81838] DEBUG (connection:569) conn=qemu+ssh://user@[IP]/system changed to state=Connecting
[Sun, 25 Dec 2016 23:17:26 virt-manager 81838] DEBUG (connection:888) Scheduling background open thread for qemu+ssh://user@[IP]/system
[Sun, 25 Dec 2016 23:17:27 virt-manager 81838] DEBUG (connection:569) conn=qemu+ssh://user@[IP]/system changed to state=Disconnected
[Sun, 25 Dec 2016 23:17:27 virt-manager 81838] DEBUG (engine:638) connect_error: conn transport=ssh
[Sun, 25 Dec 2016 23:17:27 virt-manager 81838] DEBUG (error:99) error dialog message:
summary=Unable to connect to libvirt.

An error occurred, but the cause is unknown

Verify that the 'libvirtd' daemon is running
on the remote host.
details=Unable to connect to libvirt.

An error occurred, but the cause is unknown
[...]

No workaround on my end :(

[alv000h]

+1
Same here

Libvirt URI is: qemu+ssh://user@marte/system?socket=/var/run/libvirt/libvirt-sock

Traceback (most recent call last):
File "/usr/local/Cellar/virt-manager/1.4.0/libexec/share/virt-manager/virtManager/connection.py", line 904, in _do_open
self._backend.open(self._do_creds_password)
File "/usr/local/Cellar/virt-manager/1.4.0/libexec/share/virt-manager/virtinst/connection.py", line 148, in open
open_flags)
File "/usr/local/Cellar/virt-manager/1.4.0/libexec/vendor/lib/python2.7/site-packages/libvirt.py", line 105, in openAuth
if ret is None:raise libvirtError('virConnectOpenAuth() failed')
libvirtError: An error occurred, but the cause is unknown

[alv000h]

@jeffreywildman any idea on this error?

[TheFonix]

Meanwhile we still wait :(

[dakwak]

i have been getting the same error all the way. Then I decided to use the socket in the connection URI. virt-manager --no-fork -c qemu+ssh://root@libvirthost/system?socket=/run/libvirt/libvirt-sock
in your case libvirt-sock can be somewhere else on the host, try to locate it. that should make a successful connection

UPDATE

It worked for few hours then it didn't. This is strange! the above is not anymore right for this case

[neko-kai]

This worked virt-manager -c 'qemu+ssh://user@host/session?socket=/var/run/libvirt/libvirt-sock' with ssh keys auth

[aristofanio]

This worked: virt-manager -c 'qemu:///session' (based in @Kaishh )

[roobware]

I had the same problem. Login not possible with correct string and socket parameter.
Daemon is running on server site, local check on server side of the hypervisor with virsh was successfull, but, the connection had always the error received hangup event on socket.

I searched all of the threats to this, nothing worked. Simple idea at last - setup a VirtualBox machine with the same OS as the server :) Now, i found the bug!

This was a incompatible package of netcat!
It is important, to use the openbsd netcat package on your server side!

I changed it to the openbsd netcat package and, voilà, connection is working on macOS Mojave 10.14.4 :)

[karpulix]

This worked virt-manager -c 'qemu+ssh://user@host/session?socket=/var/run/libvirt/libvirt-sock' with ssh keys auth

Thank you, this worked!