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Jobs or tasks in Veeam Backup for Microsoft 365 fail with the error: Error: [EFCoreLogging]: An error occurred using the connection to database 'cache_2331ace3-eff1-4ebb-b328-0cb948b2f5c5' on server 'tcp://vb365.domain.tld:6432'.
These connection errors can occur in larger environments when many proxies and repositories attempt to communicate with their respective cache databases concurrently. The cumulative concurrent connections can overwhelm the PostgreSQL instance.
Based on extensive testing, Veeam's RND team has found that using PgBouncer in larger environments (as detailed in the table below) to pool connections can improve communication efficiency and resolve related errors. Please follow the steps in KB4728: How to Install and Configure PgBouncer for Veeam Backup for Microsoft 365, and refer to the table below for configuration recommendations based on environment size.
Related Articles How to Install and Configure PgBouncer for Veeam Backup for Microsoft 365 PostgreSQL and PgBouncer Sizing and Configuration Guide Overcoming TCP/IP Connection Limits with PgBouncer and PostgreSQL on Windows
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