Safety of leaving ports open
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Since a few days one of my buddies is no longer able to connect with me.
A connection to the IVC server succeeds first, but breaks off when he connects via comms.
A connection without IVC is possible. It can also connect to another host normally; With ivc.
We have both installed BMS new… without success. Then I have disabled NetBIOS- filter on my router.
Since then the connection is working again. I would like to activate this filter again.
What can it be that my buddy can only connect to me in this case?