SolidWorks SNL stopped working after upgrade

We have SNL server running on a Windows 7 Enterprise 32-bit machine for a few years. Now we upgraded to version 2012-2013. The SNL server is still serving license keys to old version clients but the 2012-2013 clients are denied license keys with errors like:

15:01:53 (SW_D) DENIED: "solidworks" Jon Emil Gudmundsson@Pauk  (License server system does not support this version of this feature. (-25,334:10053 ""))

Any idea?

Thanks,

vinod@princeton.edu

SolidworksAdministration