Are Java Socket shutdownOutput and shutdownInput responsible for "Duplicate ACK #: 1" -

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at first, sorry long explanation of below issue.

i have simple tcp client. here code snippet:

        ......         ouputstream = socket.getoutputstream();      .  .....         bufferedoutputstream.flush();         socket.shutdownoutput();         ......         inputstream = socket.getinputstream();         .....         while(r=bufferedreader.read()!-1){             reading response         }         socket.shutdowninput();         .......          socket.close();

my tcp client works multiple tcp servers except 1 particular tcp server. tcp client not response server in morning , afternoon (server pick hour time) response without problem in evening, night , morning.

therefore, have used wireshark inspect packet of network during server pick hour time.

the inspection snippet of wireshark in pick hour:

 4   0.072547    ccc.ccc.ccc.ccc         sss.sss.sss.sss         tcp      66                clientport > serverport [fin, ack] seq=2008 ack=1 win=14720 len=0 tsval=992536 tsecr=4189227564  ....  ....  7   0.156504    sss.sss.sss.sss  ccc.ccc.ccc.ccc    tcp 66      serverport > clientport [ack] seq=1 ack=1449 win=8704 len=0 tsval=332931140 tsecr=259206577   8   0.159312    sss.sss.sss.sss  ccc.ccc.ccc.ccc    tcp 78      [tcp dup ack 7#1] serverport > clientport [ack] seq=1 ack=1449 win=8704 len=0 tsval=332931141 tsecr=259206577 sle=2008 sre=2009      [seq/ack analysis]         [tcp analysis flags]             [this tcp duplicate ack]         [duplicate ack #: 1]         [duplicate ack in frame: 7]             [expert info (note/sequence): duplicate ack (#1)]                 [message: duplicate ack (#1)]                 [severity level: note]                 [group: sequence]  note: sss.sss.sss.sss server ip , ccc.ccc.ccc.ccc client ip
  • is problem of tcp server? or socket.shutdownoutput() , socket.shutdowninput() responsible duplicate ack?

i not sure problem because other server ok tcp client (with shutdownouput , shutdowninput) , particular server not responding during pick hour (morning , afternoon) time working other time.

i glad, if kindly suggests me issue.

is problem of tcp server?

the problem intervening network dropping packets.

are socket.shutdownoutput() , socket.shutdowninput() responsible duplicate ack?

no.


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