centos7 – Connecting to samba share fails

I have setted up a cluster in mirror of 2 nodes with glusterfs(7.7), everything is working properly, no fails in all the logfiles, CTDB is ok, samba is working properly…but can’t connect from a windows client :-(. Firewall is disabled! Somebody an idea? Checked for samba(4.10.4) bugs but nothing special what could be a block.