Error 421 Messages

Common 421 errors include:

  • Error 421 Service not available, closing control connection.

  • Error 421 User limit reached

  • Error 421 You are not authorized to make the connection

  • Error 421 Max connections reached

  • Error 421 Max connections exceeded

You can receive a 421 error if the FTP server you are connected to limits the total number of connections available or limits the connections available to one user. To clear the error, change the number of per Site max concurrent transfers, remove items from the Queue Window, and make sure only one instance of CuteFTP is running.

To change per Site max concurrent transfers

  1. On the main menu, click Tools>Global Options.

  2. Click the Connection node.

  3. Set Per Site max concurrent transfers to 1. (By default it is set to 2. This setting limits the number of connections to any one FTP Site.

To remove items from the Queue Window

  • Sometimes the Queue Window can become cluttered with unfinished transfers. To clear the queue, right-click inside the Queue Window, then click Remove All.

To verify only one instance of CuteFTP is running on your system.

  1. Right-click on the Windows Task bar, then click Task Manager.

  2. On the Applications tab, view the list of running tasks to determine if CuteFTP is listed more than once.

  3. If more than one instance is listed, click one of them, then click End Task.