We recently upgraded to Solidworks 2015 and ever since that draftsite fails to open. on the server logs I get the following 

12:08:32 (SW_D) UNSUPPORTED: "swsustainability" (PORT_AT_HOST_PLUS   ) dpaul@USROD074  (License server system does not support this feature. (-18,327:10053 ""))

It worked fine before the upgrade and I show 3 available licenses on the server. I have also downloaded the latest version of Draftsite but still no luck>

Any Idea what my next step is?

Thanks

Mike