ndt-users list created

Hello All,

I was able to set up ndt server and client on 2 different linux boxes. 
Server is having the Suse 10.2 linux OS and the client is on Fedora7 OS. When 
I execute the client I see the following message


Testing network path for configuration and performance problems  --  Using 
IPv4 address
Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Protocol error!
Middlebox test FAILED!
checking for firewalls . . . . . . . . . . . . . . . . . . .  Protocol error!
Simple firewall test FAILED!
Protocol error!
C2S throughput test FAILED!
Protocol error!
S2C throughput test FAILED!
Protocol error!

I could not figure out what these errors mean. 
What is a middlebox? I could find any information regarding this on the ndt 
webpage too.
Could this occur due to firewall restrictions ?

Kindly can you provide me with more information regarding this.

Thanks 
Sumanth