>
> What OS are you using (client & server)?
>
linux on the server, win-xp on the client

> If you're running Windows, do you have any firewall / antivirus software
> installed? Does the problem go away if you disable it?
>
no firewall and no antivirus software

> Can you get a network capture of a case when it fails? (e.g. with
> tcpdump or wireshark)
>
never done this before ...

but that is (was) not the problem. i tried to isolate the
problem and wrote a short program running more or less the same statements but in
a direct way. and now i got NO ERRORS at all. so i think the problem couldbe setting
the parameters via reflection or something like that.

so i think i have to start from the beginning ...

thanx for helping


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