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Why is the tcp handshake on the server sometimes longer than 10 seconds?

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Why is the tcp handshake on the server sometimes longer than 10 seconds? -- Linux Enterprise Application-Linux server application information. For details, refer to the following section. The intercepted data is as follows. Please help me analyze it.
Listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
19:43:54. 473279 IP 111.173.155.127.49842> aligame1.flashpolicy: Flags [S], seq 618210536, win 8192, options [mss 1440, nop, wscale 2, nop, nop, sackOK], length 0
19:43:54. 473293 IP aligame1.flashpolicy> 111.173.155.127.49842: Flags [S.], seq 3706839090, ack 618210537, win 14600, options [mss 1460, nop, nop, sackOK, nop, wscale 9], length 0
19:43:54. 515619 IP 111.173.155.127.49842> aligame1.flashpolicy: Flags [.], ack 1, win 16560, length 0
19:43:54. 519070 IP 111.173.155.127.49842> aligame1.flashpolicy: Flags [P.], seq, ack 1, win 16560, length 23
19:43:54. 519081 IP aligame1.flashpolicy> 111.173.155.127.49842: Flags [.], ack 24, win 29, length 0
19:43:54. 540849 IP aligame1.flashpolicy> 111.173.155.127.49842: Flags [P.], seq, ack 24, win 29, length 122
19:43:54. 541622 IP aligame1.flashpolicy> 111.173.155.127.49842: Flags [F.], seq 123, ack 24, win 29, length 0
19:43:54. 584372 IP 111.173.155.127.49842> aligame1.flashpolicy: Flags [F.], seq 24, ack 123, win 16529, length 0
19:43:54. 584381 IP aligame1.flashpolicy> 111.173.155.127.49842: Flags [.], ack 25, win 29, length 0
19:43:54. 584395 IP 111.173.155.127.49842> aligame1.flashpolicy: Flags [.], ack 124, win 16529, length 0
19:43:54. 591042 IP 111.173.155.127.49841> aligame1.newoak: Flags [S], seq 2117521814, win 8192, options [mss 1440, nop, wscale 2, nop, nop, sackOK], length 0
19:43:54. 591053 IP aligame1.newoak> 111.173.155.127.49841: Flags [S.], seq 63311484, ack 2117521815, win 5840, options [mss 1460, nop, nop, sackOK, nop, wscale 9], length 0
19:43:54. 636570 IP 111.173.155.127.49841> aligame1.newoak: Flags [.], ack 1, win 16560, length 0
19:43:54. 639850 IP 111.173.155.127.49841> aligame1.newoak: Flags [P.], seq 1: 98, ack 1, win 16560, length 97
19:43:54. 639858 IP aligame1.newoak> 111.173.155.127.49841: Flags [.], ack 98, win 12, length 0


19:44:05. 800556 IP aligame1.newoak> 111.173.155.127.49841: Flags [P.], seq, ack 98, win 12, length 203
19:44:05. 866090 IP 111.173.155.127.49841> aligame1.newoak: Flags [P.], seq 98: 122, ack 204, win 16509, length 24
19:44:05. 866101 IP aligame1.newoak> 111.173.155.127.49841: Flags [.], ack 122, win 12, length 0
19:44:05. 866219 IP aligame1.newoak> 111.173.155.127.49841: Flags [P.], seq 20:232, ack 122, win 12, length 28
19:44:05. 915145 IP 111.173.155.127.49841> aligame1.newoak: Flags [P.], seq 122: 469, ack 204, win 16509, length 347
19:44:05. 915684 IP aligame1.newoak> 111.173.155.127.49841: Flags [.], seq 232: 1672, ack 469, win 12, length 1440
19:44:05. 915703 IP aligame1.newoak> 111.173.155.127.49841: Flags [.], seq 1672: 3112, ack 469, win 12, length 1440
19:44:05. 960999 IP 111.173.155.127.49841> aligame1.newoak: Flags [.], ack 1672, win 16560, length 0
19:44:05. 961010 IP aligame1.newoak> 111.173.155.127.49841: Flags [P.], seq 3112: 3351, ack 469, win 12, length 239
19:44:06. 003312 IP 111.173.155.127.49841> aligame1.newoak: Flags [.], ack 3351, win 16560, length 0
19:44:06. 022820 IP 111.173.155.127.49841> aligame1.newoak: Flags [P.], seq 469: 493, ack 3351, win 16560, length 24
19:44:06. 022882 IP aligame1.newoak> 111.173.155.127.49841: Flags [P.], seq 3351: 3768, ack 493, win 12, length 417
19:44:06. 071839 IP 111.173.155.127.49841> aligame1.newoak: Flags [P.], seq 493: 831, ack 3768, win 16455, length 338
19:44:06. 071924 IP aligame1.newoak> 111.173.155.127.49841: Flags [P.], seq 3768: 4185, ack 831, win 12, length 417
19:44:06. 071942 IP aligame1.newoak> 111.173.155.127.49841: Flags [.], seq 4185: 5625, ack 831, win 12, length 1440
19:44:06. 071956 IP aligame1.newoak> 111.173.155.127.49841: Flags [.], seq 5625: 7065, ack 831, win 12, length 1440
19:44:06. 117692 IP 111.173.155.127.49841> aligame1.newoak: Flags [.], ack 5625, win 16560, length 0
19:44:06. 117702 IP aligame1.newoak> 111.173.155.127.49841: Flags [P.], seq 7065: 7212, ack 831, win 12, length 147
19:44:06. 159779 IP 111.173.155.127.49841> aligame1.newoak: Flags [.], ack 7212, win 16560, length 0
19:44:07. 982226 IP 111.173.155.127.49841> aligame1.newoak: Flags [F.], seq 831, ack 7212, win 16560, length 0
19:44:07. 982440 IP aligame1.newoak> 111.173.155.127.49841: Flags [F.], seq 7212, ack 832, win 12, length 0
19:44:08. 027790 IP 111.173.155.127.49841> aligame1.newoak: Flags [.], ack 7213, win 16560, length 0

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