Slow network file copy on a Terminal Services Cluster

Hi All,

I hope you can help me with this issue on my recently implemented NLB Load
Balanced Terminal Services cluster.

I have 3 Terminal Servers setup as an NLB cluster

Both servers have 2 network NICs.
NLB is on one interface and Dedicated IP on another.
NLB is setup as unicast without affinity.

All servers are connected to a single GB switch dedicated to cluster.

All servers are Windows Server 2003 Enterprise Edition with Service Pack 2
and all hot-fixes applied.

We have noticed the following:

1. File copy from any terminal server to file server is normal.
2. File copy from file server (or any other server) to any terminal server
is slow (6 MB taking 4 minutes).
3. File copy from any member server from file server is normal.
4. After rebooting any terminal server problem is solved for 3 or 4 hours.

Nothing weird was found on event log and network is normal.

Anyone had this problem?

Thanks

Adriano.