[ClusterLabs] Pacemaker-remote: Connection to cluster failed: Transport endpoint is not connected

[luckydog xf]

Hi, guys,

  I'm running SLES12 sp3 and pacemaker-remote-1.1.16-4.8.x86_64, a few
months ago, compute nodes of openstack are running well.  But today when I
setup  a new compute node, it's said,"
-------------
Aug 13 16:31:04 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:   notice:
lrmd_init_remote_tls_server:    Starting a tls listener on port 3121.
Aug 13 16:31:05 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:   notice:
bind_and_listen:        Listening on address ::
Aug 13 16:31:05 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:     info:
qb_ipcs_us_publish:     server name: cib_ro
Aug 13 16:31:05 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:     info:
qb_ipcs_us_publish:     server name: cib_rw
Aug 13 16:31:05 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:     info:
qb_ipcs_us_publish:     server name: cib_shm
Aug 13 16:31:05 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:     info:
qb_ipcs_us_publish:     server name: attrd
Aug 13 16:31:05 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:     info:
qb_ipcs_us_publish:     server name: stonith-ng
Aug 13 16:31:05 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:     info:
qb_ipcs_us_publish:     server name: crmd
Aug 13 16:31:05 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:     info:
main:   Starting
-----------
and after I run `crm_mon -1r`, two lines are appended of pacemaker.log

Aug 13 16:31:38 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:    error:
ipc_proxy_accept:       No ipc providers available for uid 0 gid 0
Aug 13 16:31:38 [43122] db8-ca-3a-69-60-f4 pacemaker_remoted:    error:
handle_new_connection:  Error in connection setup (43122-43151-15): Remote
I/O error (121)

And the output of `crm_mon -1r` is

Connection to cluster failed: Transport endpoint is not connected

My environment is almost the same with other servers. So what's up ?
Thanks,
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