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Verify that Server Parameter 'log_retention_days' is greater than 3 days for PostgreSQL Database ServerVerify that server parameter 'connection_throttling' is set to 'ON' for PostgreSQL Database ServerVerify that server parameter 'log_disconnections' is set to 'ON' for PostgreSQL Database ServerVerify that server parameter 'log_connections' is set to 'ON' for PostgreSQL Database ServerVerify that 'Enforce SSL connection' is set to 'ENABLED' for PostgreSQL Database ServerVerify that Server Parameter 'log_checkpoints' is set to 'ON' for PostgreSQL Database ServerVerify that Activity Log Alert exists for Create Policy AssignmentVerify that Activity Log Alert exists for Create or Update Public IP Address ruleVerify that Activity Log Alert exists for Delete SQL Server Firewall RuleVerify that Activity Log Alert exists for Create or Update SQL Server Firewall RuleVerify that Activity Log Alert exists for Delete Network Security GroupVerify that the storage account containing the container with activity logs is encrypted with Customer Managed KeyVerify that Activity Log Alert exists for Delete Policy AssignmentVerify that Activity Log Alert exists for Create or Update Network Security GroupVerify that Diagnostic Setting captures appropriate categoriesVerify that Activity Log Alert exists for Create or Update Security SolutionVerify that Activity Log Alert exists for Delete Public IP Address ruleVerify that logging for Azure AppService 'HTTP logs' is enabledVerify that logging for Azure Key Vault is 'Enabled'Verify that the Expiration Date is set for all Keys in RBAC Key VaultsEnable Role Based Access Control for Azure Key VaultVerify that Private Endpoints are Used for Azure Key VaultVerify that the Key Vault is RecoverableVerify that HTTP(S) access from the Internet is evaluated and restricted

Verify that server parameter 'log_disconnections' is set to 'ON' for PostgreSQL Database Server

Framework Reference: A.8.20 Integration: Azure – PostgreSQL Server

Why this matters

When a session ends in PostgreSQL, the details—including session duration and reason for termination—can provide critical context for security investigations and performance analysis. Enabling log_disconnections ensures these events are captured in the system logs.

Without this setting, terminated sessions (whether intentional or abnormal) may go unnoticed. This impairs your ability to detect unexpected behavior, such as brute-force login attempts or system errors causing dropped connections.

What this check does

This Auto Check verifies whether the PostgreSQL server parameter log_disconnections is enabled.

Check Logic:
Passes if:

log_disconnections is explicitly set to on.

Fails if:

log_disconnections is unset, null, or set to off.

Applies to:

  • Azure PostgreSQL Single Server
  • Azure PostgreSQL Flexible Server
  • The check reads the parameter value through Azure’s configuration API.

How to fix it

Set the log_disconnections parameter using Azure Portal, CLI, or PowerShell.

Azure Portal:

  1. Go to Azure Database for PostgreSQL servers.
  2. Open your server and navigate to Server parameters.
  3. Find log_disconnections.
  4. Set the value to ON.
  5. Save the configuration.

Azure CLI:

az postgres server configuration set \  --resource-group <resourceGroupName> \  --server-name <serverName> \  --name log_disconnections \  --value on

PowerShell:

Update-AzPostgreSqlConfiguration `  -ResourceGroupName "<ResourceGroupName>" `  -ServerName "<ServerName>" `  -Name "log_disconnections" `  -Value "on"

Be sure to replace placeholder values with those used in your environment.

Exceptions

This check should not be disabled in production environments. For high-volume systems, enabling this setting may increase log volume. If disabling is necessary for performance reasons, document this decision along with compensating monitoring controls.

Further resources

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