'Let's play Heroes 5 online.'

Thank you for your response! We tried disabling the antivirus software – the issue persists. No one has firewalls installed as separate programs. Brandmauer is disabled.

Firewalls can be found in routers and DSL modems; pay attention to that.

How can we identify and disable them? Addition: I tried pinging the address 127.0.0... (the one in Hamachi) through "Run" -> cmd. The ping is successful. I pinged my IP address – the ping is successful. I ping my friend – no ping. Again, my friend can ping me, and he receives packets from me. :confused: