fast opening and closing connection with a specific port

Posted by michale on Server Fault See other posts from Server Fault or by michale
Published on 2012-03-19T16:39:06Z Indexed on 2012/03/19 18:07 UTC
Read the original article Hit count: 401

Filed under:

port

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tcp

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netstat

We have a Main application named "Trevor" installed in 2008R2 machine named "TEAMER12" which is slow now. One more application named "TVS" also running in and found there were many connections per second occurring to port 5009. netstat tool mentions that some fast connection open/close seen for port 5009 So first it will be listening mode like shown below

TCP    0.0.0.0:5009           TEAMER12:0        LISTENING

then establishes connection like

TCP    127.0.0.1:5009         TEAMER12:49519    ESTABLISHED
TCP    127.0.0.1:5009         TEAMER12:60903    ESTABLISHED

After that iwill become TIME_WAIT and i could see several entries like shown below

TCP 127.0.0.1:49156 TEAMER12:5009 TIME_WAIT

after that it will establish connection like

TCP    127.0.0.1:60903        TEAMER12:5009     ESTABLISHED
TCP    127.0.0.1:64181        TEAMER12:microsoft-ds  ESTABLISHED

again it will go several entries like TIME_WAIT TCP 127.0.0.1:49156 TEAMER12:5009 TIME_WAIT

Finally it will establish like this

TCP    172.26.127.40:139      TEAMER12:0        LISTENING
  TCP    172.26.127.42:139      TEAMER12:0        LISTENING
TCP    172.26.127.42:5009     TEAMER12:64445    ESTABLISHED
TCP    172.26.127.42:64445    TEAMER12:5009     ESTABLISHED

Can any body tell me whats the reason behind why many connections per second occurring to port 5009 and why application slow?

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