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This tracks making MultiSubnetFailover=true the default, as the sub-task of #4494, which also deprecates TransparentNetworkIPResolution. It affects connection string defaults and the EnableMultiSubnetFailoverByDefault AppContext switch. Behavior-change risk is moderate (parallel connection attempts, interaction with failover partner and TNIR), so it needs a compatibility opt-out. Severity: P2.
Assign to Copilot coding agent to investigate: flip the default in SqlConnectionStringBuilder / LocalAppContextSwitches.cs, keep an opt-out switch, and update tests, docs, and release notes.
Add tests covering sync and async Open, and confirm the interaction with TNIR and Failover Partner.
Note: This triage summary is auto-generated by an AI agent. The analysis and suggestions above have not been verified by a human maintainer. Please treat as preliminary guidance only.
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github-actions commentedon Oct 20, 2026
🔍 Triage Summary
Area\Azure Connectivity(connection/network behavior; also touchesArea\Managed SNI/Area\Native SNI)Analysis
This tracks making
MultiSubnetFailover=truethe default, as the sub-task of #4494, which also deprecates TransparentNetworkIPResolution. It affects connection string defaults and theEnableMultiSubnetFailoverByDefaultAppContext switch. Behavior-change risk is moderate (parallel connection attempts, interaction with failover partner and TNIR), so it needs a compatibility opt-out. Severity: P2.Next Steps
SqlConnectionStringBuilder/LocalAppContextSwitches.cs, keep an opt-out switch, and update tests, docs, and release notes.Open, and confirm the interaction with TNIR andFailover Partner.