OK this isn't exactly a perl question, but it's a tool that comes in quite handy troubleshooting perl network programming. I used to use this tool and can't recall the name of it to download again. What it does is sit and listen on a port you designate - while it's running you can see anything that connects to that port and view the commands issued. You can reply to the commands manually like as if you were the operating system. The tool is very nice when you aren't sure what is occurring on the other side of a connection to cause a script to return invalid output. Anybody know the tool I'm talking about?