hi,
just make changes in your JDE.ini file.just change all the ports to 6013 instead of 6012 every where. if that also doesn't work then make it to 6012 ever where.
Because some where in JDe.ini file , some where it Shows 6012 and some where 6013.so just make it a one Port number.
Try it htis will solve your problem.
Ankur Mahendra
CNC Consultant