APM - Session Expired/Timeout: Start a new session link

Absolute worst case, given that this is a static value in the HTML of the logout page, you could layer an LTM VIP over the APM VIP and use an iRule and STREAM profile to do the replacement.

Okay then, this is probably even messier than the last set of options, but it appears the disconnect URL is statically defined in the sesstimeout.js JavaScript file. To get to that, I'll put a layered LTM VIP in front of my APM VIP, apply a generic STREAM profile and an iRule like this:

when HTTP_REQUEST { 
    STREAM::disable

    virtual simple-1-vs

    if { [HTTP::uri] equals "/vdesk/sesstimeout.js" } {
         Don't allow data to be chunked
        if { [HTTP::version] eq "1.1" } {
            if { [HTTP::header is_keepalive] } {
                HTTP::header replace "Connection" "Keep-Alive"
            }
            HTTP::version "1.0"
        }

        HTTP::header remove Accept-Encoding
        set rewrite 1
    }
}
when HTTP_RESPONSE {
    if { [info exists rewrite] } {
        unset rewrite
        STREAM::expression {@'/vdesk/hangup.php3'@'http://yahoo.com'@}
        STREAM::enable
    }
}

Using what Kevin provided above as a starting point, I was able to get this working to support our requirements. Thanks Kevin!

In our case an external SAML SP is redirecting to the BigIP as an IdP for one of any number of URLs so we need to be able to redirect the browser to the originating URL in the event of a page timeout etc...

In case others have similar requirements, this was accomplished by creating the iRule below and referencing in the custom variable in the various page "a href" tags (e.g. "click here" link shown above).

when ACCESS_SESSION_STARTED {
    need to set a custom variable using the orig referer URL so we can_
    modify any links i.e. modal dialogue & point them back to the SP._
    This will be used by referencing the custom var as follows._
    within the html tags for "a href" put "%{session.custom.myvar}"

   ACCESS::session data set session.custom.myvar [HTTP::header value Referer]
}