Probably not out of date (my server says 2013-09-06 and is still humming happily on), but this is a Test server. I guess this license is already in use somwhere on this network (without load balancing), as that's the most probable cause of status "Off Duty".
BTW the license and control numbers are to be entered in System->Licenses->QlikView Server->QlikView Server License.
Peter, it could be something like this. Most cases I found was same thing.
But, in this case, the problem was ... 2 possibles
1 - Old instalation. In the past, the server was the production server. They buy another server and this became test server. They just change the LEF and that's it. We delete all old qlikview server stuff and reinstall it from the beggining.
2 - Version of qlikview server. We change the version and put the same as is running in prodution serer.
This 2 steps, (or just one of them) solve the problem.
That date is your maintenace end date. This means you don't have maintenace and will not be able to upgrade to any major release.
If the LEF has a specific time limit then that will show up as a special line in the LEF. However, most LEFs do not have this restriction but all LEFs will have a product date. Any major versions that were released after the product date will not accept the LEF.