[imp] Attachments on Windows 7/Vista

[lst_hoe02 at kwsoft.de]

Zitat von Ryan Beatty <ryan.beatty at gmail.com>:

> Hello,
>
> I am still struggling with this. I have used wireshark to trace the session
> when uploading a file. In the trace it works fine for a while and then I get
> TCP DUP ack failures. Eventually the upload times out.
>
> When transferring from the xp machine on the same network, its all green, no
> issues, no failures as above.
>
> I have disabled autotuning of the connection in Windows 7 as per this page.
> http://8help.osu.edu/3253.html
>
> I have also played around with the mtu size, however , no joy.
>
> Does anyone know anything else I might be able to try?

The only occasion where i have seen something like this was with  
big-sized mail from a network using a comercial firewall with some  
advanced security feature enabled. This lead to a stall connection if  
SACK (selective Acknowledgement) where used at some point of backlog.  
As the remote side had no interest in finding out the root-cause this  
is all i can say about.

Regards

Andreas

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