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Hi jason ,
I have try to test with my ndt server without port 7123 , the same error
occur :
# sudo web100clt -4 -l -n [NDT_Server_IP] -dddddd
Testing network path for configuration and performance problems  --
Send buffer initialized to 16384, Receive buffer initialized to 87380
Using IPv4 address
Requesting test suite:
 > Middlebox test
 > Simple firewall test
 > C2S throughput test
 > S2C throughput test
 > New Client, impliments queuing feedback
Server version: 3.6.4
Received tests sequence: ' 1 8 2 4'
 <-- Middlebox test -->
  -- port: 3003
connecting to [NDT_Server_IP]:3003

Send buffer initialized to 16384, Receive buffer initialized to 87380
Checking for Middleboxes ****************************** CWND limited speed =
32274.20 kbps
Done
 <-------------------->
 <-- Simple firewall test -->
checking for firewalls . . . . . . . . . . . . . . . . . . .
  -- port: 47955
  -- time: 1

Send buffer initialized to 16384, Receive buffer initialized to 87380
  -- oport: 54847

Send buffer initialized to 16384, Receive buffer initialized to 87380
Simple firewall test: no connection for 1 seconds
SIGALRM was caught
Done
 <-------------------------->
 <-- C2S throughput test -->
  -- port: 3002

Send buffer initialized to 16384, Receive buffer initialized to 87380
running 10s outbound test (client to server) . . . . . Protocol error -
missed text message!
C2S throughput test FAILED!
 <-- S2C throughput test -->
Protocol error - missed prepare message!
S2C throughput test FAILED!
Protocol error - expected results!  got ' 1', msgtype=2


# web100srv -4 -s -l /var/log/ndt/web100srv.log -dddddd
ANL/Internet2 NDT ver 3.6.4
        Variables file = /usr/local/ndt/web100_variables
        log file = /var/log/ndt/web100srv.log
        Syslog facility = default (128)
        Debug level set to 6

Send buffer initialized to 16384, Receive buffer initialized to 87380
server ready on port 3001
web100_init() read 69 variables from file
NDT server (v3.6.4) proces [24836] started at Feb 10 22:03:40
Generated iflist with device=eth0 and if_speed=7
nothing in queue
Timer not running, waiting for new connection
New connection received, waiting for accept() to complete
Select() found 1 clients ready, highest fd=3
New connection received from 0x1c22ce0 [192.168.1.153] sockfd=7.
Parent process spawned child = 24839
Parent thinks pipe() returned fd0=8, fd1=9
Child thinks pipe() returned fd0=8, fd1=9 for pid=0creating new child -
semaphore locked

Free'd ndtq semaphore lock - 1
initialize_tests returned old/new client = 1, test_suite = 1 8 2 4
Incrementing waiting variable now = 1
Line just before ChldRdy: label, did't get here via the goto statement!
___-------______  client process is ready for testing!
Telling client 24839 testing will begin now
sending 'GO' signal to client msg='go 31 1 8 2 4'
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Child 24839 received 'go 31 1 8 2 4' from parent
Got 'go' signal from parent, ready to start testing 24839
extracting test_suite ' 1 8 2 4' and t_opts '1f' from buff 'go 31 1 8 2 4'
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
setting master alarm() to 120 seconds, tests must start (complete?) before
this timer expires
Valid test sequence requested, run test for client=24839
Child process 24839 started
run_test() routine, asking for test_suite =  1 8 2 4
Starting test suite:
 > Middlebox test
 > Simple firewall test
 > C2S throughput test
 > S2C throughput test
Starting middlebox test
 <-- 24839 - Middlebox test -->
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running

Send buffer initialized to 16384, Receive buffer initialized to 87380
  -- port: 3003
Looking for Web100 data on socketid 8
Server: matt_NDT_Server;3003 Timer expired while waiting for a new
connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Client: 192.168.1.153;53993 1444;7;7;
Sending 1444 Byte packets over the network
Setting Cwnd Limit to 2888 octets
Signal 17 received by process 24839
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Finished with web100_middlebox() routine snap-0x1c22af0, sndbuff=1c26c200x
CWND limited throughput = 31696 kbps (31696)
 <--------- 24839 ----------->
Starting simple firewall test
 <-- 24839 - Simple firewall test -->
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running

Send buffer initialized to 16384, Receive buffer initialized to 87380
  -- port: 52206
  -- SFW time: 1
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
  -- oport: 50789

Send buffer initialized to 16384, Receive buffer initialized to 87380
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
SFW - SIGALRM was caught
SFW - SIGALRM was caught
Unable to create connect socket.
 <-------------------------->
Starting c2s throughput test
 <-- 24839 - C2S throughput test -->
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running

Send buffer initialized to 16384, Receive buffer initialized to 87380
  -- port: 3002
listening for Inet connection on testOptions->c2ssockfd, fd=3
Sending 'GO' signal, to tell client 24839 to head for the next test
child 24839 - sent c2s prepare to client
accept() for 24839 completed
child 24839 - c2s ready for test with fd=9
C2S test Child 24839 thinks pipe() returned fd0=10, fd1=11
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Unknown address family=17 found
IPv4 interface found address=[NDT_Server_IP]
IPv4 address match, setting device to 'eth0'
Opening network interface 'eth0' for packet-pair timing
pcap_open_live() returned pointer 0x1c288f0
installing pkt filter for 'host 192.168.1.153 and port 42660'
Initial pkt src data = 628f64
C2S test Parent thinks pipe() returned fd0=10, fd1=11
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
New IPv4 packet trace started -- initializing counters
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Waiting for new connection, timer running
Timer expired while waiting for a new connection
Queue pointer=24839, testing=1, waiting=1, mclients=0, zombie_check=0
Fault: Something in queue, but child 24839 (fd=7) has exceeded wait time
pid=24839, client='192.168.1.153', stime=1297346632, qtime=1297346632
now=1297346704
pipe-fd=9, running=1, ctlsockfd=7, client-type=1, tests='1 8 2 4'
writen() Error! write(7) failed with err='Bad file descriptor(9) pic=24836'
Processing SIGCHLD signal for active web100srv process [-1], sig17=0
Stuck child at head of queue, set pid=24839 and remove it from queue
checking for pktpair timing children, skip them
        Looking for 24839, curent queue Child 24839, host: 192.168.1.153
[192.168.1.153], next=0x0
Main test process 24839 terminated, remove from queue
Attempting to clean up child 24839, head pid = 24839
Walkingqueue
        Child 24839, host: 192.168.1.153 [192.168.1.153], next=0x0
Child process 24839 causing head pointer modification, semaphore locked
modifying queue tmp1=0x1c23170, head_ptr=0x1c23170
free tmp1=0x1c23170
Removing Child from head, decremented waiting/mclients 0/0
Free'd ndtq semaphore lock - 3
Processing SIGCHLD signal for active web100srv process [24839], sig17=0
wait4() returned 32766 for PID=0
wtermsig = 126
child_sig() routine, wait4() non-zero status (32766) returned
nothing in queueSignal 15 received by process 24839

Timer not running, waiting for new connection
Signal 17 received by process 24836
Signal 17 (SIGCHLD) received - completed tests = 1



Any help greatly appreciated.
Matt