Remember to update your allowed number of users…
Although you have enough licenses installed and have checked this for a fact, and you are experiencing the following error statement: “Error: Login exceeds maximum allowed users” when you exceed the number of 5 concurrent builtin platform licenses. In the screenshot below you see that there are 588 licenses installed.
Enter the following command with Citrix NetScaler (588 being the number of licenses that have to be installed).
set aaa parameter -maxAAAUsers 588