ZBI Developer and web server in local area network

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Hello,
i've try to write program which should connect to web server in LAN and get zpl label.
I've try to debug it in ZBI Developer.
I've connected TCPClient port to Physical connection, but i always got an error "Unable to open port"
May be port should be configured somehow.
Here is connection code
LET TCPClient = CLIENTSOCKET("TCP","10.11.12.13",80)