title: What is the reason and how to avoid the [FIN, ACK] , [RST] and [RST, ACK]
body: <p>What is the reason and how to avoid the <code>[FIN, ACK]</code>, <code>[RST]</code> and <code>[RST, ACK]</code>?</p>
  
  <p>Is it due to some mismatch between the TCP parameters of the SO´s? What does it mean when the server replies <code>[FIN, ACK]</code> in a TCP/IP connection? </p>
  
  <p><code>10.118.113.237</code> is a Solaris box, while <code>10.118.110.63</code> is a Linux box.</p>
  
  <pre><code>No.     Time           Source                Destination           Protocol Length Info
    1 0.000000000    10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 39679 [FIN, ACK] Seq=1 Ack=1 Win=49232 Len=0 TSval=62389927 TSecr=355193509
    2 0.000015000    10.118.110.63         10.118.113.237        TCP      56     39679 &gt; mmpft [RST] Seq=1 Win=0 Len=0
    4 0.119357000    10.118.110.63         10.118.113.237        TCP      68     39707 &gt; mmpft [ACK] Seq=1 Ack=93 Win=54 Len=0 TSval=355208473 TSecr=62389939
    5 0.119475000    10.118.113.237        10.118.110.63         TCP      62     mmpft &gt; 39707 [RST, ACK] Seq=93 Ack=1 Win=0 Len=0
    6 0.321336000    10.118.110.63         10.118.113.237        TCP      76     55603 &gt; mmpft [SYN] Seq=0 Win=5840 Len=0 MSS=1460 SACK_PERM=1 TSval=355208524 TSecr=0 WS=128
    7 0.321835000    10.118.113.237        10.118.110.63         TCP      80     mmpft &gt; 55603 [SYN, ACK] Seq=0 Ack=1 Win=49232 Len=0 TSval=62389959 TSecr=355208524 MSS=1460 WS=1 SACK_PERM=1
    8 0.321854000    10.118.110.63         10.118.113.237        TCP      68     55603 &gt; mmpft [ACK] Seq=1 Ack=1 Win=5888 Len=0 TSval=355208524 TSecr=62389959
    9 0.322552000    10.118.110.63         10.118.113.237        DIAMETER 276    cmd=Capabilities-ExchangeRequest(257) flags=R--- appl=Diameter Common Messages(0) h2h=3f3197c e2e=e9200846
   10 0.322891000    10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 55603 [ACK] Seq=1 Ack=209 Win=49024 Len=0 TSval=62389959 TSecr=355208524
   11 0.342554000    10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 39707 [FIN, ACK] Seq=93 Ack=1 Win=49232 Len=0 TSval=62389961 TSecr=355200968
   12 0.342567000    10.118.110.63         10.118.113.237        TCP      56     39707 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   13 0.346940000    10.118.113.237        10.118.110.63         DIAMETER 312    cmd=Capabilities-ExchangeAnswer(257) flags=---- appl=Diameter Common Messages(0) h2h=3f3197c e2e=e9200846
   14 0.347021000    10.118.110.63         10.118.113.237        TCP      68     55603 &gt; mmpft [ACK] Seq=209 Ack=245 Win=6912 Len=0 TSval=355208530 TSecr=62389961
   15 4.288733000    10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 39652 [FIN, ACK] Seq=1 Ack=1 Win=49232 Len=0 TSval=62390356 TSecr=355186382
   16 4.288757000    10.118.110.63         10.118.113.237        TCP      56     39652 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   17 4.398722000    10.118.113.237        10.118.110.63         DIAMETER 160    [TCP Retransmission] cmd=Device-WatchdogRequest(280) flags=R--- appl=Diameter Common Messages(0) h2h=f889ad2 e2e=5f8035e4
   18 4.398734000    10.118.110.63         10.118.113.237        TCP      56     39707 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   19 4.938748000    10.118.113.237        10.118.110.63         DIAMETER 160    cmd=Device-WatchdogRequest(280) flags=R--- appl=Diameter Common Messages(0) h2h=f889ad0 e2e=5f8035df
   20 4.938770000    10.118.110.63         10.118.113.237        TCP      56     39598 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   21 5.498759000    10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 39544 [FIN, ACK] Seq=1 Ack=1 Win=49232 Len=0 TSval=62390477 TSecr=355156526
   22 5.498783000    10.118.110.63         10.118.113.237        TCP      56     39544 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   23 5.648780000    10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 55774 [FIN, ACK] Seq=1 Ack=1 Win=49232 Len=0 TSval=62390492 TSecr=355111580
   24 5.648804000    10.118.110.63         10.118.113.237        TCP      56     55774 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   25 5.942885000    10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 55828 [FIN, ACK] Seq=1 Ack=1 Win=49232 Len=0 TSval=62390521 TSecr=355126129
   26 5.942901000    10.118.110.63         10.118.113.237        TCP      56     55828 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   27 6.668742000    10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 55666 [FIN, ACK] Seq=1 Ack=1 Win=49232 Len=0 TSval=62390594 TSecr=355081310
   28 6.668760000    10.118.110.63         10.118.113.237        TCP      56     55666 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   29 7.258815000    10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 55720 [FIN, ACK] Seq=1 Ack=1 Win=49232 Len=0 TSval=62390653 TSecr=355096418
   31 7.418827000    10.118.113.237        10.118.110.63         DIAMETER 160    cmd=Device-WatchdogRequest(280) flags=R--- appl=Diameter Common Messages(0) h2h=f889acd e2e=5f8035d9
   32 7.418835000    10.118.110.63         10.118.113.237        TCP      56     39490 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   33 12.948752000   10.118.113.237        10.118.110.63         DIAMETER 160    [TCP Retransmission] cmd=Device-WatchdogRequest(280) flags=R--- appl=Diameter Common Messages(0) h2h=f889ad2 e2e=5f8035e4
   34 12.948776000   10.118.110.63         10.118.113.237        TCP      56     39707 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   35 30.030087000   10.118.113.237        10.118.110.63         DIAMETER 160    [TCP Retransmission] cmd=Device-WatchdogRequest(280) flags=R--- appl=Diameter Common Messages(0) h2h=f889ad2 e2e=5f8035e4
   36 30.030113000   10.118.110.63         10.118.113.237        TCP      56     39707 &gt; mmpft [RST] Seq=1 Win=0 Len=0
   38 30.369302000   10.118.110.63         10.118.113.237        TCP      68     55603 &gt; mmpft [ACK] Seq=209 Ack=337 Win=6912 Len=0 TSval=355216035 TSecr=62392964
   39 30.369413000   10.118.113.237        10.118.110.63         TCP      62     mmpft &gt; 55603 [RST, ACK] Seq=337 Ack=209 Win=0 Len=0
   40 30.571231000   10.118.110.63         10.118.113.237        TCP      76     55630 &gt; mmpft [SYN] Seq=0 Win=5840 Len=0 MSS=1460 SACK_PERM=1 TSval=355216086 TSecr=0 WS=128
   41 30.571603000   10.118.113.237        10.118.110.63         TCP      80     mmpft &gt; 55630 [SYN, ACK] Seq=0 Ack=1 Win=49232 Len=0 TSval=62392984 TSecr=355216086 MSS=1460 WS=1 SACK_PERM=1
   42 30.571620000   10.118.110.63         10.118.113.237        TCP      68     55630 &gt; mmpft [ACK] Seq=1 Ack=1 Win=5888 Len=0 TSval=355216086 TSecr=62392984
   43 30.572253000   10.118.110.63         10.118.113.237        DIAMETER 276    cmd=Capabilities-ExchangeRequest(257) flags=R--- appl=Diameter Common Messages(0) h2h=3f3197d e2e=e9200847
   44 30.572638000   10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 55630 [ACK] Seq=1 Ack=209 Win=49232 Len=0 TSval=62392984 TSecr=355216086
   45 30.579815000   10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 55603 [FIN, ACK] Seq=337 Ack=209 Win=49232 Len=0 TSval=62392985 TSecr=355208530
   46 30.579826000   10.118.110.63         10.118.113.237        TCP      56     55603 &gt; mmpft [RST] Seq=209 Win=0 Len=0
   47 30.581517000   10.118.113.237        10.118.110.63         DIAMETER 312    cmd=Capabilities-ExchangeAnswer(257) flags=---- appl=Diameter Common Messages(0) h2h=3f3197d e2e=e9200847
   48 30.581553000   10.118.110.63         10.118.113.237        TCP      68     55630 &gt; mmpft [ACK] Seq=209 Ack=245 Win=6912 Len=0 TSval=355216088 TSecr=62392985
   49 34.138766000   10.118.113.237        10.118.110.63         TCP      68     mmpft &gt; 39679 [FIN, ACK] Seq=1 Ack=1 Win=49232 Len=0 TSval=62393341 TSecr=355193509
   50 34.138790000   10.118.110.63         10.118.113.237        TCP      56     39679 &gt; mmpft [RST] Seq=1 Win=0 Len=0
  </code></pre>