@sebastian-roth @george1421 Solved! Thank you for your time!
There is no firewall between the host and storage node. There is a firewall between the storage node and the master but is correctly configured.
The problem was that the storage node is registered at the master with his dns name and this was somehow deleted from the domain.
I have restored the dns record for the storage node and now all is functions correctly except “Storage Node Disk Usage” from the dashboard (it shows nothing), but this is not a big problem.