Is Win7 blocking UDP traffic on 127.0.0.1?

Discussion in 'Windows 7 Networking' started by mariovde, Mar 1, 2012.

  1. mariovde

    mariovde New Member

    Joined:
    Mar 1, 2012
    Messages:
    8
    Likes Received:
    0
    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
     
  2. patcooke

    patcooke Microsoft MVP
    Staff Member Premium Supporter Microsoft MVP

    Joined:
    May 16, 2010
    Messages:
    5,455
    Likes Received:
    268
    The port 30303 is known to be associated with a trojan. Have you tried a different port number?
     
  3. mariovde

    mariovde New Member

    Joined:
    Mar 1, 2012
    Messages:
    8
    Likes Received:
    0
    We've tried a lot of them.
    How can me see which port is free/open/not a trojan port?
    thanks for replying!

     
  4. patcooke

    patcooke Microsoft MVP
    Staff Member Premium Supporter Microsoft MVP

    Joined:
    May 16, 2010
    Messages:
    5,455
    Likes Received:
    268
    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. mariovde

    mariovde New Member

    Joined:
    Mar 1, 2012
    Messages:
    8
    Likes Received:
    0
    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.
     
  6. patcooke

    patcooke Microsoft MVP
    Staff Member Premium Supporter Microsoft MVP

    Joined:
    May 16, 2010
    Messages:
    5,455
    Likes Received:
    268

Share This Page

Loading...