Custom Response Upon Denial with iRule.

So, If you try the iRule below, what did you see in the /var/log/ltm file?

when CLIENT_ACCEPTED {
    log local0. "=== Client 3WHS finished"
}
when CLIENTSSL_CLIENTHELLO {
    log local0. "=== Starting SSL negotiation: [SSL::cipher version]"
}
when CLIENTSSL_HANDSHAKE {
    log local0. "=== SSL negotiation completed: [SSL::cipher version]"
}
when HTTP_REQUEST {
    log local0. "=== HTTP request [SSL::cipher version]"

    if { not ([SSL::cipher version] starts_with "TLSv1.") } {

        log local0. "=== Current request blocked for SSL: [SSL::cipher version]"

        HTTP::respond 200 content {
            Maintenance page
             **********CUSTOM DENIAL MESSAGE HERE.**********
             } Content-Type text/html Connection close
    }
}
when HTTP_RESPONSE {
    log local0. "=== HTTP replied and flow OK"
}

Please, check your /var/log/ltm file: e.g.

cat /var/log/ltm

May 20 17:47:19 bigiplab info tmm3[18141]: Rule /Common/rule_https : === Client 3WHS finished
May 20 17:47:19 bigiplab info tmm3[18141]: Rule /Common/rule_https : === Starting SSL negotiation: TLSv1.2
May 20 17:47:19 bigiplab info tmm3[18141]: Rule /Common/rule_https : === SSL negotiation completed: TLSv1.2
May 20 17:47:24 bigiplab info tmm3[18141]: Rule /Common/rule_https : === Begin HTTP request TLSv1.2
May 20 17:47:24 bigiplab info tmm3[18141]: Rule /Common/rule_https : === HTTP replied and OK


May 20 17:47:30 bigiplab info tmm3[18141]: Rule /Common/rule_https : === Client 3WHS finished
May 20 17:47:30 bigiplab info tmm3[18141]: Rule /Common/rule_https : === Starting SSL negotiation: TLSv1
May 20 17:47:30 bigiplab info tmm3[18141]: Rule /Common/rule_https : === SSL negotiation completed: TLSv1
May 20 17:47:33 bigiplab info tmm3[18141]: Rule /Common/rule_https : === Begin HTTP request TLSv1
May 20 17:47:33 bigiplab info tmm3[18141]: Rule /Common/rule_https : === Current request blocked for SSL: TLSv1

May 20 18:01:49 bigiplab info tmm[18141]: Rule /Common/rule_https : === Client 3WHS finished
May 20 18:01:49 bigiplab info tmm[18141]: Rule /Common/rule_https : === Starting SSL negotiation: SSLv3
May 20 18:01:49 bigiplab info tmm[18141]: Rule /Common/rule_https : === SSL negotiation completed: SSLv3
May 20 18:01:53 bigiplab info tmm[18141]: Rule /Common/rule_https : === HTTP request SSLv3
May 20 18:01:53 bigiplab info tmm[18141]: Rule /Common/rule_https : === Current request blocked for SSL: SSLv3

We're almost there, don't give up!