Irule Help persistence

OK, the rule can be improved for sure but let's deal with your main issue first. I assume you have persistence enabled yes? If so I would recommend you configure the option in the persistence profile to Override Connection Limits. This will keep existing users connected and new connections will get the sorry page. Of course, you'll need to test and perhaps lower to configured connection limit to take account of the override but that shouldn't be too hard. I'll post back shortly regarding the iRule.