what could be the reason that suddenly port is blocked to telenet

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I will explain the situation by the following example



on my redhat machine sometimes port 2181 is not accessible and sometimes port is accessible



example what was before one hour 



[root@master02 ~]# telnet master01 2181
Trying 100.16.60.18...
Connected to master01.
Escape character is '^]'.


example from now:



[root@master01 ~]# telnet master01 2181
Trying 100.16.28.18...
Connected to master01
Escape character is '^]'.
Connection closed by foreign host.


 netstat -nlp | grep 2181
tcp6 0 0 :::2181 :::* LISTEN 49379/java


so my question is how to know why port became blocked after some time?






linux networking rhel netstat port






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    up vote
    0
    down vote

    favorite












    I will explain the situation by the following example



    on my redhat machine sometimes port 2181 is not accessible and sometimes port is accessible



    example what was before one hour 



    [root@master02 ~]# telnet master01 2181
    Trying 100.16.60.18...
    Connected to master01.
    Escape character is '^]'.


    example from now:



    [root@master01 ~]# telnet master01 2181
    Trying 100.16.28.18...
    Connected to master01
    Escape character is '^]'.
    Connection closed by foreign host.


     netstat -nlp | grep 2181
    tcp6 0 0 :::2181 :::* LISTEN 49379/java


    so my question is how to know why port became blocked after some time?






    linux networking rhel netstat port






    share























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I will explain the situation by the following example



      on my redhat machine sometimes port 2181 is not accessible and sometimes port is accessible



      example what was before one hour 



      [root@master02 ~]# telnet master01 2181
      Trying 100.16.60.18...
      Connected to master01.
      Escape character is '^]'.


      example from now:



      [root@master01 ~]# telnet master01 2181
      Trying 100.16.28.18...
      Connected to master01
      Escape character is '^]'.
      Connection closed by foreign host.


       netstat -nlp | grep 2181
      tcp6 0 0 :::2181 :::* LISTEN 49379/java


      so my question is how to know why port became blocked after some time?






      linux networking rhel netstat port






      share













      I will explain the situation by the following example



      on my redhat machine sometimes port 2181 is not accessible and sometimes port is accessible



      example what was before one hour 



      [root@master02 ~]# telnet master01 2181
      Trying 100.16.60.18...
      Connected to master01.
      Escape character is '^]'.


      example from now:



      [root@master01 ~]# telnet master01 2181
      Trying 100.16.28.18...
      Connected to master01
      Escape character is '^]'.
      Connection closed by foreign host.


       netstat -nlp | grep 2181
      tcp6 0 0 :::2181 :::* LISTEN 49379/java


      so my question is how to know why port became blocked after some time?






      linux networking rhel netstat port




      linux networking rhel netstat port





      share












      share










      share



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      asked 8 mins ago









      yael

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