In this tutorial:

In this tutorial we will show you how to view & drop idle FTP connections in cPanel, and limit your FTP connections in FileZilla. These steps should help fix or avoid the 421 Too many connections error.

Idle FTP Connections

What is / causes an idle ftp connection?

Idle ftp connections are caused when an FTP client opens multiple connections, without closing the previous ones, or due to an incorrect setting.

VPS, Dedicated, and Managed hosting plans have the ability to modify the number of simultaneous connections allowed in their WHM; the default setting is usually 8 or 10. Increasing this limit will prevent the error messages that we will review later in this tutorial. Our Shared and Reseller plans allow up to 8 simultaneous FTP connections from 1 IP address at a time, but cannot raise this limit.

Response: 421 Too many connections (8) from this IP

view of 421 too many connections error in filezilla

If your FTP client is using more than 8 connections at the same time, you will get refused with a message similar to this:

Response: 421 Too many connections (8) from this IP
Error: Could not connect to server

Viewing / Closing Idle Connections in cPanel

  1. Login to cPanel.
  2. Click the FTP Session Control button in the Files section.
    access ftp session list
  3. You will then see a list of all your current FTP connections. Click the red X in the Disconnect column.
  4. You will then see a message similar to this "Are you sure you want to disconnect FTP user?." Click the Disconnect button to proceed.

    You are finished when you see a message like this:"The FTP session with PID 27510 was terminated. "

Limiting Simultaneous Connections in FileZilla

  1. Open FileZilla.
  2. Access the Site Manager.
    site manager in filezilla
  3. Click your site, then select the Transfer Settings tab.
  4. Check the box for Limit number of simultaneous connections, and set the Maximum number of connections to 8.
  5. Click the OK button. Now when you are using FileZilla, it will not allow you to go over your limitation of 8 simultaneous FTP connections.

Congratulations, now you know how to drop idle FTP connections in cPanel, and limit your FTP connections in FileZilla.

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Related Questions

Here are a few questions related to this article that our customers have asked:
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2014-03-07 6:49 pm
Even at only ONE connection in Filezilla, this problem occurs on a fast connection. Any other help out there?
n/a Points
2014-12-13 3:49 pm

I had this issue with my IDEs when working on remote proyects which I handle with FTP connection. Anyways, i was having this multiple connections issue 421 and i followed these instruction on here but i was still having the same issue, then, after reading this article I checked the passive move on my IDE(PHPStorm) and it worked, so i would probably suggest you give this a try, chack passive mode, and ofcourse read the article.

Good luck

11,156 Points
2014-03-10 9:21 am
While this connection may be fast, it could be unstable causing the client to incorrectly send the appropriate information to close that FTP connection. When that happens, connections continue to be opened without being closed which would cause this error.
n/a Points
2014-06-29 6:00 pm

I have same problem on New cloud fast vps server. I terminated 1 connexion and then come back and want to termiante next but it comes back and again they are 7 !

Also im tired to change hositng now as thsi before didnt do. some help? as this is not normal to uploading joomla via ftp 1 all day :(

13,760 Points
2014-06-30 8:28 am
Hello dusan,

Thank you for your comment? We are happy to help, but will need some additional information. Have you tried limiting the simultaneous connections as described in the article?

If you have any further questions, feel free to post them below.
Thank you,

n/a Points
2014-06-30 11:32 am

Well I dont understand why you send me link to this article and ask IF I TRIED this?? If I'm writting fro mthis article it means yes i supposed, and also HAVE YOU READ my post? If so you will know that i tried as i described there that.

I think you just some spam robot thats why i block your website on my antivirus and firewall!

24,266 Points
2014-06-30 12:14 pm
Hello Dusan,

We are sorry you were offended but you would be surprised at the number of people who come to an article and then ask how to do something without having tried what the article suggests. John-Paul was not trying to be offensive but to understand exactly what you have done so far.

If you are using FileZilla and have it set to not allow more than one connection, then only one should be connecting from that location. If there are more, you may want to check with your hosting company to see if they are all from you or if there are external connections.

Kindest Regards,
Scott M
n/a Points
2014-10-02 4:06 am

This is a known problem with Filezilla, although the developers will not admit it (they get angry at anyone who tries to report it, you can see in their support forums).

The only solution I found was to switch to another FTP client, which of course was difficult because otherwise Filezilla is the best one out there (except for this bug!). I have experimented with about 10 other FTP clients and this just doesn't happen with other programs, only Filezilla. Argh!

n/a Points
2014-10-10 2:40 pm
It was good for me.
n/a Points
2014-10-26 4:01 pm

try SFTP no problems for me.

n/a Points
2014-11-18 7:03 pm

I faced the same problem and i did what you wrot here but still have the same problem and didn't end .. may be the problem with server??

11,156 Points
2014-11-18 7:11 pm
It sounds like the FTP client isn't fully closing out the connections. What FTP client are you using?
n/a Points
2014-11-25 4:08 am

I tried this but its not solving my proble its again generates the connection after login


11,156 Points
2014-11-25 9:44 am
Be sure to check over your existing FTP connections in cPanel to ensure that they have all disconnected. Then, check over your FTP client to ensure that it is not attempting to open too many connections. Set the connection number to as low as possible in case the client causes a disconnection issue and opens up another connection before the previous is fully closed. Try also restarting any computers that may be connected to ensure that there are not any residual connections there.
n/a Points
2015-01-08 8:31 am

Thanks for information, it's helpful :)

n/a Points
2015-01-14 4:37 pm

My site is down and I need to upload my backup. Will my other 10 or more connections log out in time? or how should I go about connecting. 


21,617 Points
2015-01-14 11:24 pm
Hello TJ,

Sorry to hear that you're having a problem with your website. If your site is down and you're not able to connect to it via the internet, then you will need to contact our live technical support team. They can help you determine the cause of your connection problem. They can also help to determine the best way to get your backup restored and your website backup.

I hope this helps to resolve your problem. If you have any further questions or comments, please let us know.

Arnel C.

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