在我们的硬件上，我们运行了自制的ftp-server。该服务器适用于IE，FireFox，Safari，Opera 9和FileZilla等浏览器。但是，如果我使用Opera 12，则在两个ftp数据包之后关闭连接。 服务器告诉我errno = 54又名ECONNRESET。看一下WireShark转储，可以看到Opera发送了一个RST命令。我已经改变了包大小，但是在两个ftp-data包之后它再次失败了。 有谁知道为什么会发生这种情况？
Opera 12的 FAILING WireShark转储是（其中包47是RST）：
No. Time Source Destination Protocol Info
7 0.010108 172.22.4.229 172.22.6.88 FTP Response: 331 Password required for user.
8 0.010198 172.22.6.88 172.22.4.229 FTP Request: PASS opera@
9 0.011262 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=57 Ack=30 Win=9987 Len=0
10 0.013992 172.22.4.229 172.22.6.88 FTP Response: 230 User logged in successfully.
11 0.014073 172.22.6.88 172.22.4.229 FTP Request: PWD
12 0.015197 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=91 Ack=35 Win=9995 Len=0
13 0.016438 172.22.4.229 172.22.6.88 FTP Response: 257 "/" is current directory.
14 0.016524 172.22.6.88 172.22.4.229 FTP Request: EPSV ALL
15 0.017589 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=122 Ack=45 Win=9990 Len=0
16 0.018933 172.22.4.229 172.22.6.88 FTP Response: 502 Command not implemented.
17 0.019015 172.22.6.88 172.22.4.229 FTP Request: REST 0
18 0.020078 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=152 Ack=53 Win=9992 Len=0
19 0.021372 172.22.4.229 172.22.6.88 FTP Response: 502 Command not implemented.
20 0.021451 172.22.6.88 172.22.4.229 FTP Request: TYPE I
21 0.022550 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=182 Ack=61 Win=9992 Len=0
22 0.024777 172.22.4.229 172.22.6.88 FTP Response: 200 Command TYPE successful.
23 0.024856 172.22.6.88 172.22.4.229 FTP Request: SIZE LOG-20120821120000-diagnostic-diag.txt
24 0.025879 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=212 Ack=106 Win=9955 Len=0
25 0.028300 172.22.4.229 172.22.6.88 FTP Response: 250 File size: 4626418 bytes (4517 kB)
26 0.028381 172.22.6.88 172.22.4.229 FTP Request: MDTM LOG-20120821120000-diagnostic-diag.txt
27 0.029401 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=252 Ack=151 Win=9955 Len=0
28 0.030845 172.22.4.229 172.22.6.88 FTP Response: 502 Command not implemented.
29 0.030923 172.22.6.88 172.22.4.229 FTP Request: MODE B
30 0.032096 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=282 Ack=159 Win=9992 Len=0
31 0.033928 172.22.4.229 172.22.6.88 FTP Response: 502 Command not implemented.
32 0.034006 172.22.6.88 172.22.4.229 FTP Request: PASV
33 0.035098 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=312 Ack=165 Win=9994 Len=0
34 0.040963 172.22.4.229 172.22.6.88 FTP Response: 227 Entering Passive Mode (172,22,4,229,225,144).
35 0.041417 172.22.6.88 172.22.4.229 TCP 54730 > 57744 [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=2 SACK_PERM=1
36 0.041446 172.22.6.88 172.22.4.229 FTP Request: RETR LOG-20120821120000-diagnostic-diag.txt
37 0.042691 172.22.4.229 172.22.6.88 TCP 57744 > 54730 [SYN, ACK] Seq=0 Ack=1 Win=10000 Len=0 MSS=1426 SACK_PERM=1 WS=0
38 0.042716 172.22.6.88 172.22.4.229 TCP 54730 > 57744 [ACK] Seq=1 Ack=1 Win=65596 Len=0
39 0.043050 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=363 Ack=210 Win=9955 Len=0
40 0.046097 172.22.4.229 172.22.6.88 FTP Response: 150 Opening data connection.
41 0.057860 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 1426 bytes
42 0.058711 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 622 bytes
43 0.058723 172.22.6.88 172.22.4.229 TCP 54730 > 57744 [ACK] Seq=1 Ack=2049 Win=65596 Len=0
44 0.063893 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 1426 bytes
45 0.064826 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 622 bytes
46 0.064843 172.22.6.88 172.22.4.229 TCP 54730 > 57744 [ACK] Seq=1 Ack=4097 Win=65596 Len=0
47 0.070829 172.22.6.88 172.22.4.229 TCP 54730 > 57744 [RST, ACK] Seq=1 Ack=4097 Win=0 Len=0
48 0.070921 172.22.6.88 172.22.4.229 TCP 54729 > ftp [FIN, ACK] Seq=210 Ack=393 Win=65204 Len=0
49 0.072044 172.22.4.229 172.22.6.88 TCP ftp > 54729 [ACK] Seq=393 Ack=211 Win=10000 Len=0
50 0.095833 172.22.4.229 172.22.6.88 FTP Response: 451 Requested action aborted. Internal errors.
51 0.095898 172.22.6.88 172.22.4.229 TCP 54729 > ftp [RST, ACK] Seq=211 Ack=441 Win=0 Len=0
Opera 9的 WORKING WireShark转储是：
No. Time Source Destination Protocol Info
1 0.000000 172.22.6.88 172.22.4.229 TCP 54653 > ftp [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=8 SACK_PERM=1
2 0.001598 172.22.4.229 172.22.6.88 TCP ftp > 54653 [SYN, ACK] Seq=0 Ack=1 Win=10000 Len=0 MSS=1426 SACK_PERM=1 WS=0
3 0.001653 172.22.6.88 172.22.4.229 TCP 54653 > ftp [ACK] Seq=1 Ack=1 Win=65536 Len=0
4 0.007399 172.22.4.229 172.22.6.88 FTP Response: 220 FTP server ready.
5 0.022517 172.22.6.88 172.22.4.229 FTP Request: USER anonymous
6 0.023565 172.22.4.229 172.22.6.88 TCP ftp > 54653 [ACK] Seq=24 Ack=17 Win=9984 Len=0
7 0.024861 172.22.4.229 172.22.6.88 FTP Response: 331 Password required for user.
8 0.024950 172.22.6.88 172.22.4.229 FTP Request: PASS opera@
9 0.026015 172.22.4.229 172.22.6.88 TCP ftp > 54653 [ACK] Seq=57 Ack=30 Win=9987 Len=0
10 0.028033 172.22.4.229 172.22.6.88 FTP Response: 230 User logged in successfully.
11 0.028104 172.22.6.88 172.22.4.229 FTP Request: PWD
12 0.029223 172.22.4.229 172.22.6.88 TCP ftp > 54653 [ACK] Seq=91 Ack=35 Win=9995 Len=0
13 0.031091 172.22.4.229 172.22.6.88 FTP Response: 257 "/" is current directory.
14 0.031182 172.22.6.88 172.22.4.229 FTP Request: TYPE I
15 0.032228 172.22.4.229 172.22.6.88 TCP ftp > 54653 [ACK] Seq=122 Ack=43 Win=9992 Len=0
16 0.033562 172.22.4.229 172.22.6.88 FTP Response: 200 Command TYPE successful.
17 0.033635 172.22.6.88 172.22.4.229 FTP Request: SIZE LOG-20120821120000-diagnostic-diag.txt
18 0.034655 172.22.4.229 172.22.6.88 TCP ftp > 54653 [ACK] Seq=152 Ack=88 Win=9955 Len=0
19 0.037077 172.22.4.229 172.22.6.88 FTP Response: 250 File size: 4626418 bytes (4517 kB)
20 0.037154 172.22.6.88 172.22.4.229 FTP Request: MDTM LOG-20120821120000-diagnostic-diag.txt
21 0.038224 172.22.4.229 172.22.6.88 TCP ftp > 54653 [ACK] Seq=192 Ack=133 Win=9955 Len=0
22 0.040705 172.22.4.229 172.22.6.88 FTP Response: 502 Command not implemented.
23 0.040880 172.22.6.88 172.22.4.229 FTP Request: MODE B
24 0.041977 172.22.4.229 172.22.6.88 TCP ftp > 54653 [ACK] Seq=222 Ack=141 Win=9992 Len=0
25 0.043267 172.22.4.229 172.22.6.88 FTP Response: 502 Command not implemented.
26 0.043318 172.22.6.88 172.22.4.229 FTP Request: PASV
27 0.044369 172.22.4.229 172.22.6.88 TCP ftp > 54653 [ACK] Seq=252 Ack=147 Win=9994 Len=0
28 0.050959 172.22.4.229 172.22.6.88 FTP Response: 227 Entering Passive Mode (172,22,4,229,225,143).
29 0.063995 172.22.6.88 172.22.4.229 TCP 54654 > 57743 [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=8 SACK_PERM=1
30 0.064032 172.22.6.88 172.22.4.229 FTP Request: RETR LOG-20120821120000-diagnostic-diag.txt
31 0.065473 172.22.4.229 172.22.6.88 TCP 57743 > 54654 [SYN, ACK] Seq=0 Ack=1 Win=10000 Len=0 MSS=1426 SACK_PERM=1 WS=0
32 0.065507 172.22.6.88 172.22.4.229 TCP 54654 > 57743 [ACK] Seq=1 Ack=1 Win=65536 Len=0
33 0.065831 172.22.4.229 172.22.6.88 TCP ftp > 54653 [ACK] Seq=303 Ack=192 Win=9955 Len=0
34 0.068242 172.22.4.229 172.22.6.88 FTP Response: 150 Opening data connection.
35 0.082611 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 1426 bytes
36 0.083479 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 622 bytes
37 0.083494 172.22.6.88 172.22.4.229 TCP 54654 > 57743 [ACK] Seq=1 Ack=2049 Win=65536 Len=0
38 0.090274 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 1426 bytes
39 0.091103 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 622 bytes
40 0.091119 172.22.6.88 172.22.4.229 TCP 54654 > 57743 [ACK] Seq=1 Ack=4097 Win=65536 Len=0
41 0.114112 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 1426 bytes
42 0.114900 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 622 bytes
43 0.114921 172.22.6.88 172.22.4.229 TCP 54654 > 57743 [ACK] Seq=1 Ack=6145 Win=65536 Len=0
44 0.128935 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 1426 bytes
45 0.128937 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 622 bytes
46 0.128961 172.22.6.88 172.22.4.229 TCP 54654 > 57743 [ACK] Seq=1 Ack=8193 Win=65536 Len=0
47 0.140241 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 1426 bytes
48 0.141073 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 622 bytes
49 0.141088 172.22.6.88 172.22.4.229 TCP 54654 > 57743 [ACK] Seq=1 Ack=10241 Win=65536 Len=0
......
1046 4.558687 172.22.6.88 172.22.4.229 TCP 54654 > 57743 [ACK] Seq=1 Ack=690177 Win=65536 Len=0
1047 4.570837 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 1426 bytes
1048 4.570878 172.22.6.88 172.22.4.229 TCP 54654 > 57743 [FIN, ACK] Seq=1 Ack=691603 Win=65536 Len=0
1049 4.570928 172.22.6.88 172.22.4.229 TCP 54653 > ftp [FIN, ACK] Seq=192 Ack=333 Win=65024 Len=0
1050 4.571776 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 622 bytes
1051 4.572142 172.22.4.229 172.22.6.88 TCP 57743 > 54654 [ACK] Seq=692225 Ack=2 Win=10000 Len=0
1052 4.572143 172.22.4.229 172.22.6.88 TCP ftp > 54653 [ACK] Seq=333 Ack=193 Win=10000 Len=0
1053 4.581171 172.22.4.229 172.22.6.88 FTP-DATA FTP Data: 1426 bytes
1054 4.581216 172.22.6.88 172.22.4.229 TCP 54654 > 57743 [RST, ACK] Seq=2 Ack=693651 Win=0 Len=0
1055 4.591403 172.22.4.229 172.22.6.88 FTP Response: 451 Requested action aborted. Internal errors.
1056 4.591460 172.22.6.88 172.22.4.229 TCP 54653 > ftp [RST, ACK] Seq=193 Ack=381 Win=0 Len=0
答案 0 :(得分：0)
根据2007年3月的RFC 3659，尺寸响应具有以下结构：
size-response = "213" SP 1*DIGIT CRLF /
error-response
请注意，当发出213响应时，即没有响应时 错误，格式必须完全符合指定。多线响应 是不允许的。
我们的ftp服务器不是这种情况。但旧格式显然被其他ftp客户接受。