[Pacemaker] Pacemaker-corosync update attribute issue

[A66A]

Hello,
I have a problem with my 2-node cluster. In some reasons one of my nodes
can't update attributes due to error - warning: attrd_cib_callback:
Update PostgreSQL-status=HS:async failed: Transport endpoint is not
connected. Where can be a point of this issue?

Versions:
Pacemaker  - 1.1.8-7
Corosync    -  1.4.1

Iptables  - disabled
selinux  - disabled

*corosync conf: *

quorum {
    provider: corosync_votequorum
    expected_votes: 2
}
totem {
        version: 2
        secauth: off
        threads: 0

        interface {
                member {
                        memberaddr: 192.168.0.1
                }
                member {
                        memberaddr: 192.168.0.2
                }
                ringnnumber: 0
                bindnetaddr: 192.168.0.0
                mcastport: 5405
        }
    transport: udpu
}


logging {
    fileline: off
        to_stderr: yes
        to_logfile: yes
        to_syslog: yes
        logfile: /var/log/cluster/corosync.log
        debug: off
        timestamp: onOnline: [ atllab02-1 atllab02-2 ]

*crm_mon -Afr*
Full list of resources:

 Resource Group: master-group
     IP-PGSQL   (ocf::heartbeat:IPaddr2):    Started atllab02-2
     vip-rep    (ocf::heartbeat:IPaddr2):    Started atllab02-2
 Master/Slave Set: pgsql-master [PostgreSQL]
     Masters: [ atllab02-2 ]
     Slaves: [ atllab02-1 ]
 Clone Set: Apache-Clone [Apache]
     Started: [ atllab02-1 atllab02-2 ]
 Clone Set: PingD-Clone [PingD]
     Stopped: [ PingD:0 PingD:1 ]

Node Attributes:
* Node atllab02-1:
    + PostgreSQL-data-status            : STREAMING|ASYNC
* Node atllab02-2:
    + PostgreSQL-data-status            : LATEST
    + PostgreSQL-master-baseline        : 0000001370000000
    + PostgreSQL-status                 : PRI
    + master-PostgreSQL                 : 1000

Migration summary:
* Node atllab02-2:
* Node atllab02-1:
        logger_subsys {
                subsys: AMF
                debug: off
        }
}


Thanks
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