The CA Asset Portfolio Management 12.9 C3 patch cleared the database and system connection entries in the
\CA\ITAM\Web Server\ CA.Common.LoadConfigurationAttributes.dll.config file.
The correct database connection entries were present in the \CA\ITAM\Application Server directory.
1. Copy the file from the \CA\ITAM\Application Server\bin directory to the \CA\ITAM\Web Server\bin directory.
2. Perform an IISRESET on both the APM application and APM web servers.