I stuck with creating a simple connection between S7-1214C and PC. I used the TCONinstruction toestablish the connection(from the TCP conn. example). Regardless of the simple TCON instruction I couldn'tmanage to create the connection. blush

ThePC and theCPU are visible on theLAN and arein the same subnet. After the REQ for conn.the flag BUSY is always ON and the status is 7002. I can never get the DONE or ERRORflag.I deactivated the firewall and the antiviruson th PC to be sure that the port is open (2000) anddeactivate all other functions in the CPU except the TCON call,butthe problem remain the same.mad

The see more deeply into the TCP comm. I used Wireshark to analyze the comm. Apparently, something is wrong in the TCP handshake! The first packet form the CPUis SYN but the reply from the PC is RST-ACKwhich is used to terminate the connection. The reply from the PC should be SYN-ACK...Itried the connection to the different PC also - but theproblemremains.

What else I could try to establish the communication?

Thanks in advance for your suggestions and advices.

Kind regards,