3716142 - SAP HANA System Replication: “communication channel closed during data shipping” during initial synchronization although network and configuration are correct

During SAP HANA System Replication setup or re-registration, the secondary site does not reach ACTIVE state.
The replication repeatedly stops for one tenant database while SYSTEMDB replication appears synchronized.

The following errors are observed:

communication channel closed
connection lost during data shipping

The issue typically occurs after takeover, DR test, re-registration, or when a new secondary host is introduced.

Additional observations:

• Typically only a specific tenant database is affected
• Replication remains in Full Replica / initializing phase
• Replication restarts repeatedly
• No communication path problem can be identified

In SAP HANA traces (secondary site):

indexserver trace shows allocation failures similar to:

Out of memory (allocation failure type: GLOBAL_ALLOCATION_LIMIT)

and shortly before the replication interruption:

service unavailable

SAP HANA DB Version 2.0

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