Forum Discussion

TMdog21_318632's avatar
TMdog21_318632
Icon for Nimbostratus rankNimbostratus
Apr 25, 2017

Connection Refused

I have a customer trying to connect via telnet to the VIP on our F5, the first attempt, refused, second attempt is refused but the third attempt the connection is established. not sure why that is happening. Where on the F5 would I find that type of info? its an 5200.

 

Thanks

 

BIG-IP
security
  • Samir_Jha_52506's avatar
    Samir_Jha_52506
    Icon for Noctilucent rankNoctilucent
    Apr 25, 2017

    Mostly back end server port flap issue. Please check the back-end server.

    Unix comamnd

        netstat -an | grep “:25 “
    netstat -plnt | grep ':80'
    • TMdog21_318632's avatar
      TMdog21_318632
      Icon for Nimbostratus rankNimbostratus
      Apr 25, 2017

      thanks. Im a total newbie. I don't know how to get to the command line. is that a putty sessin type of thing?

       

    • TMdog21_318632's avatar
      TMdog21_318632
      Icon for Nimbostratus rankNimbostratus
      Apr 25, 2017

      I don't see how those two commands help me. I'm looking for traffic that may be getting dropped by the F5.