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Originally Posted by Paul M
3. RWIN is a tcp setting, not an http/ftp setting, so it should affect all or none.
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Yes but no.
Because NTL operate a transparent web proxy cache, the actual source of HTTP traffic is always close to the client, so that good TCP throughputs will be achieved even with a low RWIN setting.
With FTP traffic (irrespective of port number), the RWIN matters a great deal more, and given that the connection is international, I do indeed think that the poster should try increasing their RWIN for long-haul FTP downloads.
To imporve FTP uploads, it is the server's RWIN that needs to be increased.