DummyServer is a simple TCP server program, written in Java, which can listen on one or more ports for client connections. On each connection it responds with a banner which includes an "ident tag" and the port its listening on, waits to read one line of text from the client, echoes it back and then closes the connection. If the text is the word "QUIT", then the server terminates. It was originally written to assist students in hand-on data networking & Cisco network labs by giving them a target server to access on any desired port on host systems.

Usage
DummyServer can run in both command-line and GUI modes. If run with no arguments (ie the JAR file is directly executed), it will use the GUI interface. This displays a window with text field for entering the desired port number and a server identity tag. Note that the user running the program must be permitted to use the desired port number (ie must have root/administrator privileges on most respectable O/S's to bind to ports less than 1024). The identity tag is typically the name of the system or some other identifer for the server. It is shown to clients when they connect to it. Once these values are entered the server may be started. Multiple servers can be started on different ports.

Once the server is running, the log window lists connections to it from clients.

Alternatively, the DummyServer can be run on the command-line with additional arguments specifying the port and an optional identity_tag thus:
DummyServer port [ident_msg]

This starts a single server on the specified port. The log of connections is written to standard error for the program.

Requirements:
* Java

The license of this software is Freeware, you can free download and free use this server utility software.