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From the v9 SR4 Release Notes:
Windows Server 2008 has port 4747 turned off by default. QVS will then fall back to HTTPtunneling which may have an adverse effect on performance.
How do I do this on my server? Do I create an Inbound Rule that just allows TCP for port 4747? How do I check if it's working (NOT tunneling)?
You can verify communication on port 4747 by using Telnet
Open a cmd.exe on a klient machine and write
telnet <serverip> 4747
You should get at blank window if the port is open.
You should open 4747 both inbound and outbound on the server and client.