ndt-users list created

[Richard Carlson <>]

Hi Larry;

I'm the developer of the NDT system but I don't have physical access 
to the ANL server (miranda.ctd.anl.gov now renamed ndt.anl.gov).  The 
NDT server and Java applet client have a simple communications 
protocol that maintains the status of each test.  The "Protocol 
error!" message indicates that the client and server have slipped out 
of sync and they aren't communicating properly.  Are you saying that 
this client successfully runs the Middlebox and SFW tests, but then 
fails on the C2S test?

If so, then my first action would be to look at the client PC's TCP 
window configuration settings.  It is possible that the TCP send 
window is too large and the client is queuing up a lot of data.  In 
this case the client would still try and send data while the server 
is attempting to move on to the S2C test.  The result is the 
"Protocol error!" failure message.

If you point your client to the Internet2 public NDT server 
http://ndt.internet2.edu:7123  I can look at the test results in more detail.

Rich
At 10:00 PM 2/26/2008, 

 wrote:
> Hello,
>
> We have a customer who is a EE running Miranda (which we recommend) 
> from his 802.11b connection to our wireless (RURAL) network who is 
> experiencing the error below the sig.
>
> A search using Google wasn't very productive.
>
> What are the likely causes?
>
> Kind regards/ldv
>
> Larry Vaden
> Internet Texoma, Inc.
> ASN 4963 Since 1995
>
> running 10s outbound test (client-to-server [C2S]) . . . . . Protocol error!
> C2S throughput test FAILED!
> Protocol error!

------------------------------------



Richard A. Carlson                              e-mail: 

Network Engineer                                phone:  (734) 352-7043
Internet2                                       fax:    (734) 913-4255
1000 Oakbrook Dr; Suite 300
Ann Arbor,  MI  48104