Is Win7 blocking UDP traffic on 127.0.0.1?

#1
Hi,

We are building an 2 application that connect to 127.0.0.1:30303.
They are used to send data from app A to app B, acting as a local p2p connection.

On windows XP, everything runs as it should. On windows 7 it doesn't work anymore.
We've tried turning off the firewalls, opening ports etc but we cannot get this connection to work on Windows 7.

Anyone got an idea of what changed in Windows 7 regarding tcp/udp or socket changes?

Thanks guys!

Mario
 


patcooke

Microsoft MVP
Staff member
Premium Supporter
Microsoft MVP
#2
The port 30303 is known to be associated with a trojan. Have you tried a different port number?
 


#3
We've tried a lot of them.
How can me see which port is free/open/not a trojan port?
thanks for replying!

The port 30303 is known to be associated with a trojan. Have you tried a different port number?
 


patcooke

Microsoft MVP
Staff member
Premium Supporter
Microsoft MVP
#4
Try using the default ftp ports 21 on the server and 20 on the client. I assume you've confirmed connectivity with a ping test on localhost?
 


#5
Yes, that test is running fine.
The ports need to be above 1024 for this app...Both of them are writting in Actionscript and build as an AIR application
Strange stuff. Nothing extra needed to be done on XP. Strange we need to do this on Win7.
 


patcooke

Microsoft MVP
Staff member
Premium Supporter
Microsoft MVP
#6
There is a free utility for examining current ports and status here (I tend to use it for monitoring and controlling activity) - might be of some help:

Download cports.zip Free - CurrPorts 2.00 install file
 


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