421 too many connections (8) from this ip – FileZilla fix

Related documents:
[1] Installing FileZilla FTP Client

This blog entry is an overview on how to fix the following error in your FTP client:

421 too many connections (8) from this ip

This may sometimes be accompanied with a “Delaying connection for 5 seconds due to previously failed connection attempt” error.

We will be using FileZilla in this example. If you do not know FileZilla or how to use it, we recommend reviewing our blog entry on How to install FileZilla .

Lets start, open up FileZilla, and click on “File” on the top left and then click on “Site Manager”:

2) Once inside SiteManager:

If the site doesn’t already exist in the list: click “New Site” and fill out the necessary information and continue.

Once the site exists in the list, choose it and go to the “Transfer Settings” tab:

From here, simply click on the checkmark box next to “Limit number of simultaneous connections” and you can keep “1” in the box like such:

Thats all, now Press “Connect” on the bottom left and give it another try. If you run into any problems, simply comment here and we’ll get you helped.

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23 Comments on 421 too many connections (8) from this ip – FileZilla fix

  1. selva says:

    Thanks For your step by step explanations.Follow your step, i am fixed that error.

  2. Ken says:

    I tried that and I still get the 421 Too many connections (4) from this IP error.

  3. You may need to completely shut things down so the previous connections are killed.

  4. Pingback: How to Install Filezilla Client | Arvixe Blog

  5. Saurabh says:

    Dear member’s,

    Getting this same problem when i am connecting my FTP, it stops at MLSD

    230-Your bandwidth usage is restricted
    Response: 230-User share127 has group access to: 150
    Response: 230-OK. Current directory is /
    Response: 230 114 Kbytes used (0%) – authorized: 51200 Kb
    Command: PBSZ 0
    Response: 200 PBSZ=0
    Command: PROT P
    Response: 534 Fallback to [C]
    Status: Connected
    Status: Retrieving directory listing…
    Command: PWD
    Response: 257 “/” is your current location
    Command: TYPE I
    Response: 200 TYPE is now 8-bit binary
    Command: PORT 10,0,0,250,4,94
    Response: 500 I won’t open a connection to (only to
    Command: PASV
    Response: 227 Entering Passive Mode (202,71,129,226,195,229)
    Command: MLSD

    What i have to do now to resolve this problem. Please tell me

  6. Tolun Cerkes says:

    Yes choosing active mode in the site manager’s transfer settings tab resolved my problem. Thank you.

  7. No matter what alterations I make to the configurations in the “Site Manager” option, my connection always times out and I can’t connect to the server. What did I miss?

  8. David Ho says:

    Thanks! Exactly what I was looking for – kudos!!!

  9. AB says:

    Thank you, it took me a while to find this but this fixed it all. Props.

  10. Moran says:

    I did what you wrote, but I still get this error…

  11. First i was getting a “421 too many connections (12) from this ip” error, but read and did what this page says, so now i getting a

    “Response: 200 PORT command successful
    Command: MLSD
    Respons: 425 Could not open data connection to port 49657: Connection timed out”

    What do i do?

  12. kensoXd says:


  13. Ryan Harne says:

    Still got the problem, even on sftp & active mode… so need to drop all connections, for windows.
    >> Command Prompt
    >> ipconfig /renew

  14. kenneth says:

    yes choose the active .. and the problem will solve thanks for this 🙂

  15. Juhi says:

    Even after complying with the settings suggested, I am getting the error 421. Can you please help?

  16. Matt says:

    I’ve had this problem for a while, i’ve changed the settings, dropped all my connections via command prompt, limited my connections to 1 (even tho my server allows 8) and changed transfer to Active. I’m on Windows 7 Professional so any help is hugely apreciated. I’ve looked over the FileZilla forums but the support is limited and not very useful!

  17. InsaneOne22 says:

    Thanks for this advice, I’m now able to deploy/retreive my website without worring about problems …

    Thanks dude !

  18. Yan says:

    Wow, thank you so much! This solution solved my problem. Keep up and continue sharing!

  19. Thanks for the info. I actually just ran into this problem and couldn’t figure it out. I found a forum where a few people had this issue and they all concurred that there was nothing that can be done about it… Just that Filezilla thinks that you are hacking if you disconnect and reconnect repeatedly which is what the client does for every file. Anyway, thanks; I implements your fix and it is running smooth now.

  20. Chris says:

    I turned off my firewall and it worked

  21. Jay says:

    Just go to: Site manager……….Advanced………..Server type (In server type change what it is supposed to be, mine was Unix)
    All worked fine and this problem came just after an Flilezilla had an update……..new update nulled the server type

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