Problem:
Cannot Rediscover/Refresh a router on RA Admin > Enable Interfaces on a RA system running on Windows Server 2008 R2 (64-bit).
A big grey box with an error message is displayed that tells you to edit a web.config. When you go to the harvester for that router and try to load http://localhost/ProxyServices/PollingProxyWS.asmx in a browser, you get the following error:
Could not load file or assembly 'DnDns' or one of its dependencies.
An attempt was made to load a program with an incorrect format.
Resolution:
- Open up Server Manager
- Expand Roles
- Expand Web Server (IIS)
- Click on Internet Information Services (IIS) Manager
- In the right-middle pane, click on Application Pools
- In the far-right pane, right-click on ProxyServices and click on Advanced Settings
- In the (General) section at the top, change Enable 32-Bit Applications to TRUE
- Run an IISRESET

Additional Information:
Please note that RA 9.0 is end of life and you should consider upgrading to ensure that you are running a supported environment.
https://www.ca.com/us/services-support/ca-support/ca-support-online/product-content/status/support-life-cycle/ca-network-flow-analysis-r9_1-sp1-r9_1-ca-netqos-reporteranalyzer-r9_0-sp1-r9_0-eos-announcement.html