Running 2014.1 against POA 2012

I have noticed something strange...

My current GW system is 2012.x

If I install gw2014.1 client on a clean win 7 and tries to logon to 2012 POA it is rejected.

If I install gw2012 client, uninstalls it and install gw2014.1 then I can connect to 2012 POA..