Segment size problem

I use apache HttpClient upload xml file to a server, and it is https. It works for some files, but for some of them i can not even get response, and use snoop to check networking, i found out, for the bad cases, there is one frame shows "unreassembled packet" and the checksum is INCORRECT, the size of the frame is 1514, the total length in Internet Protocol is 1500, but in the beginning of connection it shows MSS=1460,
so who can explain the realtionship between these numbers, and where i can configure or control the segment size when uploading, or it is impossible.

yes, 1514 is right, and the checksum incorrect is beacuse i am using snoop right on my server, the checksum has not been calculated by NIC, it is always 0, now i noticed the problem happens when the segment reachs 1460, and then, this packet is "unreassambled". So, i am wondering where is the problem, SSL, or system configure, or somthing else. By the way, my server is solaris 10 , and the peer, i am not soure, IBM, but i think they may use proxy server.

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http://www.eurotaac.com
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Segment size

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