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asked 2018-04-06 14:01:03 +0000

Heron
1 ●1 ●1

Hi everybody,

I'm working on an issue where some Telnet connections are reseted. Since I'm new to this, any help will be greatly apreciated.

In the conversation below, we can see a lot of retransmissions from the client to the server and the end, the connection get reseted by the server after 3 retransmission in a row. I assume the reset a consequence of those retransmissions, am i right ?

What could cause these retransmissions ? Server too busy ? already checked, it doesn't seems so Network issue in between ? nothing on the interfaces

Here is the link : https://wetransfer.com/downloads/e2be...

Thanks

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answered 2018-04-06 14:43:53 +0000

Jasper
24103 ●5 ●111 ●292 Düsseldorf, Germany

There is only one true retransmission in your capture file, the rest are simply duplicate packets causing those and the duplicate ACKs. See more about this phenomenon here:

https://blog.packet-foo.com/2015/03/t...

The reason for the reset is hard to say - there's not that much to see in the packets, but it's not a network issue at all, because the network transports the packets just fine. My guess is that either the connection was finished in a good way, or something happened that can't be told from the packets, at least not without more insight into what the conversation was doing (as it's not the usual Telnet shell stuff).

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