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HELP! Looking at a specific (HTTPS) TCP stream (1936 packets) I start to get Malformed Packet: SSL after packet 782

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All,

we're baffled with an issue encountered. We're monitoring (using tshark) off an inline TAP sitting between a client browser (pc) and web server. I can see the 3-way handshake incl. the SSL v3 handshake thereafter. I can see the GET / requests from client to server incl. the 'Continuation or non-HTTP traffic' from the server back to the client (in producing the HTTP response). All fine so far.

At packet 782 we start to see 'Continuation Data[Malformed Packet]' messages and I'm unable to decrypt the conversation thereafter... No more SSL dissector :(

It's also at this stage where I get heaps of duplicate ACKs from the client back to the server. The server then responds with a number of TCP retransmissions. This continues till the connection is closed (RST).

I don't see any dropped packets from the captured interface so we should have all the segments and hence be able to decrypt it, no? We really have our hair in a twist with this one :) I'm happy to share the pcap sample with anyone keen enough to help. I've searched the Internet and this forum and I didn't come up with anything tangible.

Please help!

Thx

Jaco Greyling


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