Running a Policy Server, running the SmLimitAuth module, this one permanently reports the following message:
No stored session, returning null, no action.][SmLimitAuth:Check: No stored session, returning null, no action.
At login time, the Policy Server doesn't find a response to apply to OnAuthAccept with smlimitauth expression.
According to the documentation, there should be one and some other configuration too:
Limit Concurrent Login for CA Single Sign-On
Method One
This method records the Session Id of the user immediately after the user authenticates.
[...omitted for brevity...]
Define an OnAuthAccept rule, an OnAcceptRedirect response and a policy. The rule must have the action set to Authentication Events with OnAuthAccept selected. The Response should be a Webagent-OnAccept-Redirect response with an Attribute Kind of Active Attribute. Use SmLimitAuth for the Library Name (case sensitive). The function name is Login (also case sensitive).
p.13
Configure the corresponding OnAuthAccept rule and OnAcceptRedirect response to ensure the smlimitauth is filled with a value at the authentication phase to solve this issue.
The documentation can be found in the package containing the binaries of the smlimitauth module.