Hello,

I'm using a 4 node cluster oVirt 4.1. After updating the Engine to 4.2.3.8 (and 
ContOS 7.5), I tried to update the nodes too.
Unfortunally, the live migration is not working (any more). Maybe it's related 
to following error found in engine.log

2018-06-19 09:32:53,469+02 WARN  
[org.ovirt.engine.core.bll.provider.network.openstack.CustomizedRESTEasyConnector]
 (EE-ManagedThreadFactory-engineScheduled-Thread-7) [4d6a7dc4] Cannot register 
external providers trust store: java.io.IOException: Keystore was tampered 
with, or password was incorrect
2018-06-19 09:32:53,475+02 ERROR 
[org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand] 
(EE-ManagedThreadFactory-engineScheduled-Thread-7) [4d6a7dc4] Command 
'org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand' failed: 
EngineException: (Failed with error unable to find valid certification path to 
requested target and code 5050)

I'm using the selfsigned CA provided with oVirt.

Nodes (source and destination)
OS-Version:RHEL - 7 - 4.1708.el7.centos
Kernelversion: 3.10.0 - 693.21.1.el7.x86_64
KVM-Version:2.9.0 - 16.el7_4.14.1
LIBVIRT-Version:libvirt-3.2.0-14.el7_4.9
VDSM-Version:vdsm-4.19.45-1.el7.centos
SPICE-Version:0.12.8 - 2.el7.1
CEPH-Version:librbd1-0.94.5-2.el7
Kernel Features:PTI: 1, IBPB: 0, IBRS: 0

engine.log for the mirgration:
2018-06-14 13:13:30,300+02 INFO  
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] 
(EE-ManagedThreadFactory-engine-Thread-246968) [] EVENT_ID: 
VM_MIGRATION_START_SYSTEM_INITIATED(67), Migration initiated by system (VM: 
vm_to_migrate, Source: SOURCE, Destination: DESTINATION, Reason: Host preparing 
for maintenance).
2018-06-14 13:13:32,886+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmsStatisticsFetcher] 
(EE-ManagedThreadFactory-engineScheduled-Thread-94) [] Fetched 8 VMs from VDS 
'f3749f1e-a68d-424f-aa3a-f0ec996df498'
2018-06-14 13:13:32,887+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-94) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) was unexpectedly detected 
as 'MigratingTo' on VDS 'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) 
(expected on 'ea7bae8f-d966-4baa-b8b4-a5522b88ec3a')
2018-06-14 13:13:32,887+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-94) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111' is migrating to VDS 
'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) ignoring it in the refresh 
until migration is done
2018-06-14 13:13:47,939+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-42) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) was unexpectedly detected 
as 'MigratingTo' on VDS 'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) 
(expected on 'ea7bae8f-d966-4baa-b8b4-a5522b88ec3a')
2018-06-14 13:13:47,939+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-42) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111' is migrating to VDS 
'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) ignoring it in the refresh 
until migration is done
2018-06-14 13:14:02,993+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-13) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) was unexpectedly detected 
as 'MigratingTo' on VDS 'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) 
(expected on 'ea7bae8f-d966-4baa-b8b4-a5522b88ec3a')
2018-06-14 13:14:02,993+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-13) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111' is migrating to VDS 
'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) ignoring it in the refresh 
until migration is done
2018-06-14 13:14:18,042+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-67) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) was unexpectedly detected 
as 'MigratingTo' on VDS 'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) 
(expected on 'ea7bae8f-d966-4baa-b8b4-a5522b88ec3a')
2018-06-14 13:14:18,042+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-67) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111' is migrating to VDS 
'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) ignoring it in the refresh 
until migration is done
2018-06-14 13:14:33,090+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-85) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) was unexpectedly detected 
as 'MigratingTo' on VDS 'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) 
(expected on 'ea7bae8f-d966-4baa-b8b4-a5522b88ec3a')
2018-06-14 13:14:33,090+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-85) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111' is migrating to VDS 
'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) ignoring it in the refresh 
until migration is done
2018-06-14 13:14:38,356+02 INFO  
[org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand] 
(EE-ManagedThreadFactory-engineScheduled-Thread-43) [6d991f10] Lock Acquired to 
object 
'EngineLock:{exclusiveLocks='[d1457e7e-f29d-49ac-b635-2457a7cbc59f=PROVIDER]', 
sharedLocks=''}'
2018-06-14 13:14:38,369+02 INFO  
[org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand] 
(EE-ManagedThreadFactory-engineScheduled-Thread-43) [6d991f10] Running command: 
SyncNetworkProviderCommand internal: true.
2018-06-14 13:14:38,370+02 WARN  
[org.ovirt.engine.core.bll.provider.network.openstack.CustomizedRESTEasyConnector]
 (EE-ManagedThreadFactory-engineScheduled-Thread-43) [6d991f10] Cannot register 
external providers trust store: java.io.IOException: Keystore was tampered 
with, or password was incorrect
2018-06-14 13:14:38,379+02 ERROR 
[org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand] 
(EE-ManagedThreadFactory-engineScheduled-Thread-43) [6d991f10] Command 
'org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand' failed: 
EngineException: (Failed with error unable to find valid certification path to 
requested target and code 5050)
2018-06-14 13:14:38,382+02 INFO  
[org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand] 
(EE-ManagedThreadFactory-engineScheduled-Thread-43) [6d991f10] Lock freed to 
object 
'EngineLock:{exclusiveLocks='[d1457e7e-f29d-49ac-b635-2457a7cbc59f=PROVIDER]', 
sharedLocks=''}'
2018-06-14 13:14:48,139+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-92) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) was unexpectedly detected 
as 'MigratingTo' on VDS 'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) 
(expected on 'ea7bae8f-d966-4baa-b8b4-a5522b88ec3a')
2018-06-14 13:14:48,139+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-92) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111' is migrating to VDS 
'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) ignoring it in the refresh 
until migration is done
2018-06-14 13:15:03,193+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-71) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) was unexpectedly detected 
as 'MigratingTo' on VDS 'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) 
(expected on 'ea7bae8f-d966-4baa-b8b4-a5522b88ec3a')
2018-06-14 13:15:03,193+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-71) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111' is migrating to VDS 
'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) ignoring it in the refresh 
until migration is done
2018-06-14 13:15:18,242+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-63) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) was unexpectedly detected 
as 'MigratingTo' on VDS 'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) 
(expected on 'ea7bae8f-d966-4baa-b8b4-a5522b88ec3a')
2018-06-14 13:15:18,242+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-63) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111' is migrating to VDS 
'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) ignoring it in the refresh 
until migration is done
2018-06-14 13:15:33,293+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-17) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) was unexpectedly detected 
as 'MigratingTo' on VDS 'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) 
(expected on 'ea7bae8f-d966-4baa-b8b4-a5522b88ec3a')
2018-06-14 13:15:33,293+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-17) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111' is migrating to VDS 
'f3749f1e-a68d-424f-aa3a-f0ec996df498'(DESTINATION) ignoring it in the refresh 
until migration is done
2018-06-14 13:15:45,377+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-10) [] VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) moved from 
'MigratingFrom' --> 'Up'
2018-06-14 13:15:45,377+02 INFO  
[org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] 
(EE-ManagedThreadFactory-engineScheduled-Thread-10) [] Adding VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'(vm_to_migrate) to re-run list
2018-06-14 13:15:45,400+02 ERROR 
[org.ovirt.engine.core.vdsbroker.monitoring.VmsMonitoring] 
(EE-ManagedThreadFactory-engineScheduled-Thread-10) [] Rerun VM 
'4aff4193-ba75-481d-92b3-59b62cd8b111'. Called from VDS 'SOURCE'
2018-06-14 13:15:45,451+02 INFO  
[org.ovirt.engine.core.vdsbroker.vdsbroker.MigrateStatusVDSCommand] 
(EE-ManagedThreadFactory-engine-Thread-247023) [] START, 
MigrateStatusVDSCommand(HostName = SOURCE, 
MigrateStatusVDSCommandParameters:{hostId='ea7bae8f-d966-4baa-b8b4-a5522b88ec3a',
 vmId='4aff4193-ba75-481d-92b3-59b62cd8b111'}), log id: 25f95334
2018-06-14 13:15:45,453+02 INFO  
[org.ovirt.engine.core.vdsbroker.vdsbroker.MigrateStatusVDSCommand] 
(EE-ManagedThreadFactory-engine-Thread-247023) [] FINISH, 
MigrateStatusVDSCommand, log id: 25f95334
2018-06-14 13:15:45,478+02 WARN  
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] 
(EE-ManagedThreadFactory-engine-Thread-247023) [] EVENT_ID: 
VM_MIGRATION_TRYING_RERUN(128), Failed to migrate VM vm_to_migrate to Host 
DESTINATION . Trying to migrate to another Host.
2018-06-14 13:15:45,557+02 INFO  [org.ovirt.engine.core.bll.MigrateVmCommand] 
(EE-ManagedThreadFactory-engine-Thread-247023) [] Running command: 
MigrateVmCommand internal: true. Entities affected :  ID: 
4aff4193-ba75-481d-92b3-59b62cd8b111 Type: VMAction group MIGRATE_VM with role 
type USER
2018-06-14 13:15:45,595+02 INFO  
[org.ovirt.engine.core.vdsbroker.MigrateVDSCommand] 
(EE-ManagedThreadFactory-engine-Thread-247023) [] START, MigrateVDSCommand( 
MigrateVDSCommandParameters:{hostId='ea7bae8f-d966-4baa-b8b4-a5522b88ec3a', 
vmId='4aff4193-ba75-481d-92b3-59b62cd8b111', srcHost='10.157.8.37', 
dstVdsId='69ebacd7-ee55-4c52-abf1-437a14d5fb0d', dstHost='10.157.8.42:54321', 
migrationMethod='ONLINE', tunnelMigration='false', migrationDowntime='0', 
autoConverge='false', migrateCompressed='false', consoleAddress='null', 
maxBandwidth='500', enableGuestEvents='false', maxIncomingMigrations='2', 
maxOutgoingMigrations='2', convergenceSchedule='null', 
dstQemu='192.168.1.113'}), log id: 736d023f
2018-06-14 13:15:45,595+02 INFO  
[org.ovirt.engine.core.vdsbroker.vdsbroker.MigrateBrokerVDSCommand] 
(EE-ManagedThreadFactory-engine-Thread-247023) [] START, 
MigrateBrokerVDSCommand(HostName = SOURCE, 
MigrateVDSCommandParameters:{hostId='ea7bae8f-d966-4baa-b8b4-a5522b88ec3a', 
vmId='4aff4193-ba75-481d-92b3-59b62cd8b111', srcHost='10.157.8.37', 
dstVdsId='69ebacd7-ee55-4c52-abf1-437a14d5fb0d', dstHost='10.157.8.42:54321', 
migrationMethod='ONLINE', tunnelMigration='false', migrationDowntime='0', 
autoConverge='false', migrateCompressed='false', consoleAddress='null', 
maxBandwidth='500', enableGuestEvents='false', maxIncomingMigrations='2', 
maxOutgoingMigrations='2', convergenceSchedule='null', 
dstQemu='192.168.1.113'}), log id: 58572c5b
2018-06-14 13:15:45,601+02 INFO  
[org.ovirt.engine.core.vdsbroker.vdsbroker.MigrateBrokerVDSCommand] 
(EE-ManagedThreadFactory-engine-Thread-247023) [] FINISH, 
MigrateBrokerVDSCommand, log id: 58572c5b
2018-06-14 13:15:45,604+02 INFO  
[org.ovirt.engine.core.vdsbroker.MigrateVDSCommand] 
(EE-ManagedThreadFactory-engine-Thread-247023) [] FINISH, MigrateVDSCommand, 
return: MigratingFrom, log id: 736d023f

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