Tom_Zhang

Hi Mikael, It can't be that. Because The connection is just between my pc and the module we want to control. Besides, it can get through and read back the data sometimes. This morning i was told that when change to labview 2009, it seems ok. Confused... Anyway, thank you, guys. Thanks for your kind help. Tom

1) Yes, use dot notation Ip address, but not host name. 2）Yes, and the local port is 502,Fixed and do not need the OS to select anymore. 3) Timeout set is 200ms, i thinkit's not the problem, because ever i set this to 5000ms, but still, ths error occured. I just don't know why. 4) No, i have not check this. The communication is from the PC to a module we need to control, but not another PC. Anyway i didn't try this. I've attached the picture. Thanks for your reply. Hi MikaelH, Thanks for your reply. You can see my reply picture? The error occured at the TCP/IP open stage, and nerver sent strings, so you mean when i excute the TCP open function i can check the network bytes by some other tools? Tom

Hello guys, I'm a engineer from China, and got a question need your help. We have a project need TCPIP communication, and run in ths Chinese OS, it's ok. But when changed to English OS, something wrong when excute TCP open function, sometimes ok, and sometimes error occured with the error code 56. The firewall (including the system firewall), and the anti virus software are all closed. I'm confused so much. Anyone could help? Tom