![]() This may have something to do with FTP going through one or more NAT boxes. Anyone have any ideas what the problem might be? All this is to no avail, as any FTP server software I use still complains that port 21 is already in use. I uninstalled all of my FTP software, rebooted multiple times, ran a virus scan to make sure there were no trojans using port 21 (McAfee came up clean), for good measure I ran Ad-Aware and Spybot, and even installed network monitoring software, which reports that port 21 is listening and is not in use. ![]() ![]() However, it worked fine for more than day before this issue developed. For the record, this FTP server is behind a NAT router using an internal IP address. I tried various other FTP server software, and they all gave the same error when I actually tried to put the server online they claimed that port 21 was already in use. It kept saying that software on my host machine had ended the connection. It worked fine for awhile but suddenly I found that no one could connect to the server. I set up an FTP server a few days ago (Cerberus FTP Server). ![]()
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