skynet.be pop3 servers don't like tcp_window_scaling anymore...

For some reason if I use window scaling the pop3 servers from belgacom and skynet just don't react anymore. I did tcpdumps and I noticed two things: 1 the window size on my size (5882 bytes) is slighty larger then the first message and 2 it is the belgacom server that tells me the data is coming and then sends nothing anymore.

One really wonders how you have to misconfigure a firewall to get this effect.

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I'm anoyed the "helpdesk" claimed it is not their problem :-(.