this file server will not allow any additional users to log on

It's now 9 months later with no apparent fix - way to go Apple. In the meantime, I've started backing-up our computers using CrashPlan to a hard drive I keep at the office. CrashPlan (free) has some nice features - like if you have to interrupt a back-up, you don't have to start over, you just pick-up where you left off. Plus, it's off-site back-up!

The only other solution I've developed for Time Machine is to schedule my MacMini hub to restart every morning at 3:00 AM. This has the effect of clearing out the cache and allowing computers to connect again.

Refer to the post from sesweitzer and set maxconnections to 1000. That is what finally solved this problem for me. I'm not sure if I have too many computers, ATVs, and iOS devices or what, but that solved it.

I've read through the thread and have gotten myself thoroughly flustered. I have a MBP and a Mac Mini. Connected to the Mini I have two external hard drives, a Toshiba, which is dedicated to my Time Machine backups, and LaCie that has my iPhoto Library and iTunes music on it. MBP is two years old; mini is older. I really only use the Mini pretty much for streaming music as I have nice speakers hooked up as well as wireless speakers for the upstairs. So, I recently upgraded the Mini to ML. I then saw that my MBP system preference for Time Machine was not "on," so I thought, better turn that on since it's really my main computer. I did and it did a backup, but I noticed that it was backing up to the LaCie and not the Toshiba. So I went looking for the Toshiba drive in System Preferences, and here's where I get flustered. I can't remember if it was showing up at one time and that's when I got the "no additional users" msg or not. I tried some of the things in this thread. Still got the msg. I deleted the .plst preferences as mentioned in a previous post. In addition to that file, there was an almost identical file that ended ".plst.lockfile" It remained after I deleted the .plst file. I have restarted both computers a couple of times. I have tried the Terminal suggestion; I'm really unfamiliar with that application, so I'm not sure I did it right. I see users talking about upgrading to "OS X Server," and I have no ideat what that is or if I should. At this point, the Mini shows both of the hard drives in the TM system preference and will happily back up ti the Toshiba. The MBP is not showing that hard drive and will happily back up to the LaCie. I guess I can continue doing this, but I'd rather keep backups on the Toshiba.

Okay, that feels like a novella it's so long! I also know these posts are from at least six months ago. Thanks for reading.

Ellen

I don't know what I did, but the Toshiba is now available to the MBP, and all seems to be well. Go figure.😕

In Yosemite, I had SMB and AFP working, but not FTP.

This is how you enable old FTP in the terminal:

sudo -s launchctl load -w /System/Library/LaunchDaemons/ftp.plist

Hello,

I know, this thread is ancient, but THANK YOU so much. This simple solution fixed my issue. Running a 2006 1st gen Intel Mac and finally upgraded and wanted to use this a file server. Working great now.