yeah that worked.
Indeed its a little bit "tricky". My HBA initiator on the server side do not detect the drives/devices in default group, until i create a new group with WWPN Alias.
Only after that procedure im able to put some FC Targets in default group and connect to them.
Maybe im doing something wrong with the HBA configuration on the server side. I'll have to figure out...
But as you said, the best solution is to disconnect the cables from the server, to do some restarts caused by a new configuration.