Hi Ashish,
The ValidTargetDomain parameter identifies the valid domains for the target during processing. Before the user is redirected, the agent compares the values in the redirect URL against the domains in this parameter. Without this parameter, the agent redirects the user to targets in any domain.
The ValidTargetDomain parameter can include multiple values, one for each valid domain.
For local agent configurations, specify an entry, one entry per line, for each domain, for example:
validtargetdomain=".xyzcompany.com"
validtargetdomain=".abccompany.com"
Refer below link:
https://support.ca.com/cadocs/0/CA%20SiteMinder%2012%2052-ENU/Bookshelf_Files/HTML/idocs/1525270.html#o256533
Thanks,
Sharan