iRule delete cookie in HTTP REQUEST

Have you tried adding logging to the ltm log (/var/log/ltm) to see if you ever get to the redirect? Also, if you use Fiddler (Windows) or something like the built in network monitor on Chrome or Firefox, what kind of response do you see from the page request?

when HTTP_REQUEST {
    set redirect https://domainsite.com/vdesk/hangup.php3 
    log local0. "URI: '[HTTP::uri]'"
    if { [HTTP::uri] contains "logout.xxx" } {
        log local0. "  Redirecting to '$redirect'"
        HTTP::respond 302 Location $redirect "Set-Cookie" "ASP.NET_SessionId=;path=/; HttpOnly; domain=domainsite.com; Expires=Thu, 01-Jan-1970 00:00:00 GMT"            
    }
}

I personally have not had any luck using

HTTP::respond 302 $content

the cookie still remains on the browser, how is it possibile? ( Session cookie with the HTTP flag = true & No secure flag)

did you see browser sending the session cookie in subsequent request?

the cookie still remains on the browser, how is it possibile? ( Session cookie with the HTTP flag = true & No secure flag)

did you see browser sending the session cookie in subsequent request?