Hi Sandeep,
Kindly clarify the version of Siteminder you are using and also the OS.
In case you are using Redhat 7, it is not a supported platform for R12.52 and R12.6
# https://support.ca.com/phpdocs/7/5262/5262_12_6_platform-support.pdf
At the time of policy server development on Red Hat 7, 64 bit, RSA did not offer SDK support for this platform, so RSA Authentication Manager is not yet supported on the Policy Server running on Red Hat 7.
If you navigate to page 13, you can see the supported platforms for RSA Authentication Manager.
# https://support.ca.com/phpdocs/7/5262/5262_SiteMinder_12_52_SP1_Platform_Support.pdf
If you navigate to page 44, you can see the supported platforms for RSA Authentication Manager.
Having mentioned the above, you will need to configure "SecureID Authentication scheme" in Single Sign On {fka Siteminder}.
Below is the link to the documentation giving more information about this authentication scheme and how you can configure it.
https://wiki.ca.com/display/sm1252sp1/SecurID+Authentication+Schemes