Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10) Dovecot Solution

This happens because Dovecot limits the maximum IMAPconnections per IPto just 10. This may be fine for a single client side IPbut if an entire office or multiple users are behind one IPor a single heavy user is active then you will get bizarre errors in your e-mail clients such as "Password Incorrect" or similar in Thunderbird. It won't be obvious on the client side as to what the problem is and they will probably just think the server is misconfigured.

dovecot: imap-login: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10): user=, method=PLAIN, rip=10.15.12.5, lip=10.15.12.59, TLS
Jul 10 14:16:21 mailserverdovecot: imap-login: Warning: SSL alert: where=0x4008, ret=256: warning close notify [10.15.12.5]


add this to dovecot.conf:


mail_max_userip_connections = 50

Restart dovecot and after that you should be good to go.

Note that some users say you have to put the above in an imap stanza like this (but it was not necessary for me):

protocol imap {
mail_max_userip_connections = 50
}


Tags:

maximum, connections, user, ip, exceeded, mail_max_userip_connections, dovecot, solutionthis, imap, multiple, users, active, errors, quot, password, incorrect, thunderbird, server, misconfigured, login, domain, method, tls, jul, mailserverdovecot, ssl, ret, notify, conf, restart, stanza, protocol,

Latest Articles

  • Debian Ubuntu Mint Howto Create Bridge (br0)
  • How To Control Interface that dhcpd server listens to on Debian based Linux like Mint and Ubuntu
  • LUKS unable to type password to unlock during boot on Debian, Ubuntu and Mint
  • Debian Ubuntu and Linux Mint Broken Kernel After Date - New Extra Module Naming Convention
  • Wordpress overwrites and wipes out custom htaccess rules and changes soluton
  • Apache htaccess and mod_rewrite how to redirect and force all URLs and visitors to the SSL / HTTPS version
  • python 3 pip cannot install mysql module
  • QEMU-KVM won't boot Windows 2016 or 2019 server on an Intel Core i3
  • Virtualbox vbox not starting "No suitable module for running kernel found"
  • Bind / named not responding to queries solution
  • Linux Mint How To Set Desktop Background Image From Bash Prompt CLI
  • ImageMagick Convert PDF Not Authorized
  • ImageMagick Converted PDF to JPEG some files have a black background solution
  • Linux Mint Mate Customize the Lock screen messages and hide username and real name
  • Ubuntu/Gnome/Mint/Centos How To Take a partial screenshot
  • ssh how to verify your host key / avoid MIM attacks
  • Cisco IP Phone CP-8845 8800/8900 Series How To Reset To Factory Settings Instructions
  • ls how to list ONLY directories
  • How to encrypt your SSH private key file id_rsa
  • Linux Mint 18 Disable User Name List from showing on Login Screen