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Status Submitted
Created by Guest
Created on Jan 6, 2026

FAP application to support multi-subnet failover

Hi,


After Q1 2025 our team proceeded with network migration to greenfield, after which our Cognos MSSQL server went from this setup: one primary, one backup; to this setup: cluster server - when one is in maintenance or overloaded, the other one takes over.


We have an alias that is applied to both servers: cognos-prod-db. We had a problem with ODBC driver, that it didn't failover to the other server using this alias. Going through IBM documentation we found that we should use Microsoft SQL Server Native Client 11.0 driver instead of SQL server driver, as it has the multi-subnet failover checkbox, which we checked. The issue with the driver was fixed, but now FAP application doesn't allow to log in when it fails over to the other server. Once it goes back to the "primary" server it allows it log in, but in the logs it shows that it cannot connect to FAP db. Checked the connection through windows Powershell and ODBC drivers configuration and everything works fine, no issues.


Together with IBM Support we found that we need to enable MultiSubnet Failover in config file and additional parameters field of the application, this didn't help as it was still trying to connect to previous IP address, basically the parameter doesn't work.


Our current and only workaround is flushing dns, I have modified our nightly FAP restart script that clears the dns before it starts the service and created another script that checks Net Connection and if it fails - flushes the dns. This isn't a long-term solution as it still has some minor downtimes. This affects all of our reports ( ~200 users) and slows down data validation and report creation.


We would need FAP application to accepts MultiSubnet Failover.

Needed By Yesterday (Let's go already!)