I use Netware 6.0, and I bought 5 new licenses and were given 6.5 as 6.0
was not available and I was told that is OK.

I have installed the 5 licenses but they never get used and sometimes I
get connection problems.

In Netware Admin, the tree looks like this:
Novell+Netware 6 Server+600
Novell+Netware 6 User+600
SN: 111
SN: 222
Novell+Netware 6 User+650
SN: 333

Do I need to get the 6.5 licenses into the 6.0 area, or what do I need to
do to get the extra licenses to work?

Kind regards