On a NetScaler appliance, you may see some built-in commands are failed because feature is not licensed. For example, you use a Standard/Enterprise license, avaiable features in Premium license may have some built-in commands, and they'll get failures. 

It will not cause any business impact to production. But you may see some default configuration that doesn't follow official command reference guide. 

Log example: 

Jun 26 09:09:09 <local0.info> ns nsconfigd: _dispatch(): Failing command: "set cmp parameter -cmpLevel optimal -quantumSize 57344 -serverCmp ON -minResSize 0 -cmpBypassPct 100 -cmpOnPush DISABLED -addVaryHeader DISABLED -externalCache NO", Error: cmd not applied as Feature(s) not licensed.

The issue is fixed in all builds of 14.1, 13.1 Build 50.23 and higher. 13.0 doesn't have the fix because it's EOL.  

Problem Cause

Features are not licensed.