Multiple Network Card and Firewall Problems of Serial Device Server

Multiple Network Card and Firewall Problems of Serial Device Server

 

Multiple network card and firewall problems  There are a lot of situations in these two problems, please turn off the PC's Windows firewall and unused network cards before the communication test. If it can not find the device after it starts, the TCP connection will not be on or other phenomena.     

 

About the multiple network card: the network card refers to the peripherals on the computer that are used to access the Internet. For example, the desktop computer has a wired network card (the mouth of the network cable). In addition to the wired network card, the laptop also has a WIFI wireless network card; What’s more, we may also use 3G network card, or virtual machine (it will also cause the effect of the network card)  Please disable the redundant network card when starting the communication test, only keep one, as shown below (take win7 as an example). We only reserve one local connection and the wireless network live connection has been disabled.    About windows firewall  Please turn off the firewall that comes with Windows before the communication test, because it will intercept most of the TCP communication, please close it in the following location.