Are you using the latest version of Serv-U? v6.0.0.2
I have Serv-U v6.0.0.2 installed for testing and I'm not seeing any problems with connecting with FlashFXP on Windows XP.
The command line ftp client doesn't send the FEAT command, perhaps serv-u is trying to read a corrupted value or something for this command, you could try turning off FEAT as a test.
Site Manager > Options Tab > Uncheck "Site does not support FEAT command"
As a test I believe you can also manually send FEAT using ftp.exe, this might help you narrow down the problem.
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