Symptom:
In Unity Connection 9.x - "utils cuc cluster renegotiate" on the subscriber server fails with this message at the last step,

13/12/01 14:32:15  Disabling data replication...
13/12/01 14:32:28  Renegotiating ssh trusts...
13/12/01 14:32:36  Synchronizing platform and LDAP database...
13/12/01 14:35:20  Creating any missing messaging databases on the publisher...
13/12/01 14:35:23  Adding subscriber node to publisher...
13/12/01 14:35:30  Synchronizing Unity Connection databases...
13/12/01 14:43:19  Synchronizing file systems...
13/12/01 14:43:23  Synchronizing message files for mail store UnityMbxDb1...
13/12/01 14:43:25  Copying cluster DSCP configuration to publisher node...
13/12/01 14:43:27  Rebooting publisher node CUC-9A...
Cluster renegotiation failed.

The cluster renegotiation log cuc-cluster-rejoin_2013-12-01_14.32.15.log can be found in the installation logging location through the CLI or RTMT.

admin:file tail install cuc-cluster-rejoin_2013-12-01_14.32.15.log
++ test no == yes
++ get_platform_config_value CcmDBHost
++ xml sel -t -v /PlatformData/CcmDBHost/ParamValue /usr/local/platform/conf/platformConfig.xml
+ sudo -u cucluster ssh CUC-9A /usr/local/cm/bin/controlcenter.sh 'Service Manager' stop
++ error
++ '[' 0 -eq 1 ']'
++ '[' 0 -eq 1 ']'
++ echo 'Cluster renegotiation failed.'
++ echo 'The cluster renegotiation log cuc-cluster-rejoin_2013-12-01_14.32.15.log can be found in the installation logging location through the CLI or RTMT.'
++ exit 1


Fails while trying to stop Service Manager,
+ sudo -u cucluster ssh CUC-9A /usr/local/cm/bin/controlcenter.sh 'Service Manager' stop

Conditions:
Seen on Unity Connection 9.1.2