can you edit your sqldeveloper.conf file and change the line towards the end to enable debug mode?
then run through this again and supply all the additional logging messages
After enable debug, windows firewall ask for permission for damain network, after granting the problem vanished.
I try to reproduce and disable the rules for sqldeveloper64w and go back to nondebug mode, but the problem not occur again.
The problem is gone.
Just interested, can you tell what happens there?
I was wrong, the problem is there again, i try to figure was the trigger is.
I cant reproduce the problem anymore, it is gone, i also tried to remove the firewall entries instead of disable them but still no problem.