TCP: troubles with outgoing tcp/ip after sp1

after installation of w2k3 sp1 i have serious tcp problems.

the problems:
- 3-5% ping loss to *any* non-localhost-ip
- ftp uploads fail if file size is greater than 8kb ("unable to open data
connection" / "data connection timeout")
- outlook express fails to send out smtp mails ("unable to connect to
server")
- vpn connection breaks up every other minute

the setup:
- this is an out-of-the box configuration. the machine has 2 different
interfaces, both having these problems.
- windows firewall is disabled.
- tcp/ip filtering is disabled.
- windows 2000 on same machine works fine!

the workaround:
- packet loss: no clue so far
- sending out mails: when resetting the network interface (i.e.:
disabling/enabling the nic), operation works for a few minutes as it should.

it looks like some problems with the tcp-ip stack here. connecting to the
target socket works, but resulting in a timeout from time to time before any
data is sent.

any pointers how to further test and elaborate the problem is more than
welcome! i've spent hours trying and countless reinstals to solve this
problem without any luck.

would be sad to switch back to w2k ;-(

- thomas


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