我想发起一个HTTPS POST请求,但连接在一开始就突然中断了。我用Wireshark工具进行了如下捕获。192.168.0.33是我的客户端,试图连接服务器192.185.47.210。
No. Time Source Destination Protocol Length Info
51 2.476681000 192.168.0.33 192.185.47.210 TCP 62 1143→443 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 SACK_PERM=1
52 2.534541000 192.185.47.210 192.168.0.33 TCP 62 443→1143 [SYN, ACK] Seq=0 Ack=1 Win=29200 Len=0 MSS=1460 SACK_PERM=1
53 2.534559000 192.168.0.33 192.185.47.210 TCP 54 1143→443 [ACK] Seq=1 Ack=1 Win=65535 Len=0
54 2.534720000 192.168.0.33 192.185.47.210 TLSv1 163 Client Hello
56 2.592332000 192.185.47.210 192.168.0.33 TCP 60 443→1143 [ACK] Seq=1 Ack=110 Win=29200 Len=0
57 2.594550000 192.185.47.210 192.168.0.33 TLSv1 191 Server Hello, Change Cipher Spec, Encrypted Handshake Message
58 2.596455000 192.168.0.33 192.185.47.210 TCP 54 1143→443 [FIN, ACK] Seq=110 Ack=138 Win=65398 Len=0
60 2.654542000 192.185.47.210 192.168.0.33 TCP 60 443→1143 [FIN, ACK] Seq=138 Ack=111 Win=29200 Len=0
61 2.654558000 192.168.0.33 192.185.47.210 TCP 54 1143→443 [ACK] Seq=111 Ack=139 Win=65398 Len=0
我怀疑问题出在第57个数据包上,因为客户端在接收到该数据包后会发起TCP连接断开。第57个数据包的格式如下:
Frame 57: 191 bytes on wire (1528 bits), 191 bytes captured (1528 bits) on interface 0
Ethernet II, Src: Actionte_39:b9:de (18:1b:eb:39:b9:de), Dst: CadmusCo_f6:2b:9b (08:00:27:f6:2b:9b)
Internet Protocol Version 4, Src: 192.185.47.210 (192.185.47.210), Dst: 192.168.0.33 (192.168.0.33)
Transmission Control Protocol, Src Port: 443 (443), Dst Port: 1143 (1143), Seq: 1, Ack: 110, Len: 137
Secure Sockets Layer
TLSv1 Record Layer: Handshake Protocol: Server Hello
Content Type: Handshake (22)
Version: TLS 1.0 (0x0301)
Length: 81
Handshake Protocol: Server Hello
TLSv1 Record Layer: Change Cipher Spec Protocol: Change Cipher Spec
Content Type: Change Cipher Spec (20)
Version: TLS 1.0 (0x0301)
Length: 1
Change Cipher Spec Message
TLSv1 Record Layer: Handshake Protocol: Encrypted Handshake Message
Content Type: Handshake (22)
Version: TLS 1.0 (0x0301)
Length: 40
Handshake Protocol: Encrypted Handshake Message
其他信息:
客户端是在Windows XP上运行的C#程序。调用是通过WebRequest类(https://msdn.microsoft.com/zh-cn/library/system.net.webrequest%28v=vs.110%29.aspx)进行的。服务器位于共享托管(Hostgator),具有专用IP和来自COMODO的SSL证书。
问题
有人能帮我理解为什么接收数据包57会导致客户端断开连接吗?