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HANA Replication - Alert "Connection between systems in system replication setup" (id 78)

Hi

I'm getting this email alert from the HANA tenant database:

snapshot   : 2015-08-18 16:42:52.0000000

Alert Name : Connection between systems in system replication setup

Rating     : Error

Details    : At 2015-08-18 18:35:45.0000000 on hostp01:30103; Site 2: Communication channel closed

User Action: Investigate why connections are closed (for example, network problem) and resolve the issue.

I see more alerts in the trace files, don't know if they are related:

Tenant's database trace files:

[178728]{419183}[119/-1] 2015-08-18 20:56:11.225670 e cePlanExec cePlanExecutor.cpp(07183) : Error during Plan execution of model _SYS_STATISTICS:_SYS_SS_CE_1402084_140190768844608_4_INS (-1), reason: executor: plan operation failed;CalculationNode ($$_SYS_SS2_RESULT$$) -> operation (CustomLOp):Compilation failed; OpenChannelException at network layer:

  message: an error occured while opening the channel

  info:    connection refused

  param:   127.0.0.1:30110


Replication database trace files:

nameserver_alert_hostp01.trc

[42096]{-1}[-1/-1] 2015-08-18 18:45:18.355758 e TrexNet          EndPoint.cpp(00260) : ERROR: failed to open channel 127.0.0.1:30107! reason: (connection refused)

Please assist.

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