Skip to content
  • Solutions
    By Role
    • For Developers
    • For Content Managers
    • For Agencies
    • For IT Admins
    • For Web Hosters
    • For Developers
    • For Content Managers
    • For Agencies
    • For IT Admins
    • For Web Hosters
    By Infrastructure
    • Overview
    • AWS
    • Microsoft Azure
    • Alibaba Cloud
    • Google Cloud Platform
    • Vultr
    • Overview
    • AWS
    • Microsoft Azure
    • Alibaba Cloud
    • Google Cloud Platform
    • Vultr
    • Digital Ocean
    • Linode
    • Upcloud
    • Oracle
    • OVH
    • Digital Ocean
    • Linode
    • Upcloud
    • Oracle
    • OVH
  • Product
    • Plesk Features
    • Plesk Editions
    • What’s new
    • Pricing
    • Roadmap
    • Lifecycle Policy
    • Extensions Catalogue
  • Pricing
  • Extensions
    Featured Extensions
    • SocialBee
    • WP Toolkit
    • Sitejet Builder for Plesk
    • SEO Toolkit
    • Joomla! Toolkit
    • Premium Email
    • Email Security
    • SocialBee
    • WP Toolkit
    • Sitejet Builder for Plesk
    • SEO Toolkit
    • Joomla! Toolkit
    • Premium Email
    • Email Security
    Bundles and packs:
    • Business and Collaboration Edition
    • WP pack
    • Hosting pack
    • Power pack
    • Language pack
    • Business and Collaboration Edition
    • WP pack
    • Hosting pack
    • Power pack
    • Language pack

    See all Extensions

  • For Partners
    • Plesk Contributor Program
    • Plesk Partner Program
    • Affiliate program
    • Plesk University
  • Help Center
    • Documentation
    • Professional Services
    • Support
    • Contact Us
    • Wiki
    • Forum
  • Plesk 360 login
  • Free Trial
  • Pricing
  • Solutions
    • By Role
      • For Developers
      • For Content Managers
      • For Agencies
      • For IT Admins
      • For Web Hosters
    • By Infrastructure
      • Overview
      • Plesk on Amazon Web Services (AWS & Lightsail)
      • Microsoft Azure
      • Alibaba Cloud
      • Google Cloud Platform
      • Vultr
      • DigitalOcean
      • Linode
      • UpCloud
      • Oracle
      • OVH
  • Products
  • Pricing
  • Extensions
    • Featured Extensions
      • SocialBee
      • WP Toolkit
      • Sitejet Builder for Plesk
      • SEO Toolkit
      • Joomla! Toolkit
      • Premium Email
      • Email Security
    • Bundles and packs:
      • Business and Collaboration Edition
      • WP pack
      • Hosting pack
      • Power pack
      • Language pack
      • See all Extensions
  • For Partners
    • Plesk Contributor Program
    • Plesk Partner Program
    • Affiliate Program
    • Plesk University
  • Help Center
    • Documentation
    • Professional Services
    • Support
    • Contact Us
    • Wiki
    • Forum
  • Plesk 360 login
  • Free Trial
  • Pricing
  • Solutions
    • By Role
      • For Developers
      • For Content Managers
      • For Agencies
      • For IT Admins
      • For Web Hosters
    • By Infrastructure
      • Overview
      • Plesk on Amazon Web Services (AWS & Lightsail)
      • Microsoft Azure
      • Alibaba Cloud
      • Google Cloud Platform
      • Vultr
      • DigitalOcean
      • Linode
      • UpCloud
      • Oracle
      • OVH
  • Products
  • Pricing
  • Extensions
    • Featured Extensions
      • SocialBee
      • WP Toolkit
      • Sitejet Builder for Plesk
      • SEO Toolkit
      • Joomla! Toolkit
      • Premium Email
      • Email Security
    • Bundles and packs:
      • Business and Collaboration Edition
      • WP pack
      • Hosting pack
      • Power pack
      • Language pack
      • See all Extensions
  • For Partners
    • Plesk Contributor Program
    • Plesk Partner Program
    • Affiliate Program
    • Plesk University
  • Help Center
    • Documentation
    • Professional Services
    • Support
    • Contact Us
    • Wiki
    • Forum
  • Plesk 360 login
  • Free Trial
Plesk 360 login
Free Trial

Knowledge Base

IP addresses are being banned by Fail2Ban on a Plesk server when working from Email Client

 
dovecotemailfail2banipplesk for linux

Symptoms

  • When sending/receiving messages from Email Client (such as Outlook), the user's IP address is blocked by Fail2Ban
  • From other IP addresses Plesk, websites and email accounts are accessible
  • The IP address 203.0.113.2 can be found in Plesk at Tools & Settings > IP Address Banning (Fail2Ban) > Banned IP Addresses

Cause

The user IP address has been banned by fail2Ban "recidive" and "plesk-dovecot" jails because Email client actions are triggering false-positives on fail2ban.

Resolution

Apply one of the following solutions:

  • Adjust fail2ban settings ban period and number of attempts before the ban to mitigate such false-positives: How to change the Fail2ban ban period and the number of attempts before the ban in Plesk?

  • Add client IP to trusted IP-Addresses:

    Note: With the following solution, the problem may reoccur in case the client IP address will change.

    1. Connect to the server via SSH with a different IP address

    2. Open Tools & Settings > IP Address Banning (Fail2Ban) > Trusted IP Addresses > Add Trusted IP

    3. Add the IP address to be trusted in the text field IP address and click OK

Tweet
Share
Share
Email
0 Shares
Read the full article
Related Posts

How to Use Fail2ban to Secure Your Linux Server (CentOS, Ubuntu, Debian, Fedora, and Plesk)

Read More »

How to Avoid High CPU Load and Block Hackers and Bad Bots Effectively

Read More »

Full Site Check now scans for Google Fonts

Read More »
Knowledge Base

Unable to open Plesk or a website or log in to an email account from a specific IP address: ERR_CONNECTION_TIMED_OUT

Read More »

AWStats page does not display images on Plesk server: AH01630: client denied by server configuration

Read More »

Unable to connect to mailbox on Plesk via IMAP/POP3: “Maximum number of connections from user+IP exceeded” OR “Maximum connection limit reached”

Read More »

System logs on a Plesk server are not populating when the rsyslog package is not installed

Read More »

Hosting Wiki

  • Server Redundancy
  • Dovecot
  • Bare Metal Server
  • Oracle VM Server
  • Server Virtualization Software
  • Windows Server
  • Linux
  • JavaScript
  • Plesk
  • Web Server
  • DNS Server
  • IPv6
  • IPv4
  • SIP
  • SSH
  • UDP/IP
  • Email Autoresponder
  • Email Alias
  • Email Virus Protection
  • Email Forwarding
  • TCP/IP
X-twitter Linkedin Youtube Reddit Github
  • Product
  • Login
  • Pricing
  • Editions
  • For Partners
  • Partner Program
  • Contributor Program
  • Affiliate Program
  • Plesk University
  • Company
  • Blog
  • Careers
  • Events
  • About Plesk
  • Our Brand
  • Resources
  • User and Admin guides
  • Help Center
  • Migrate to Plesk
  • Contact Us
  • Hosting Wiki
  • Forum
  • Legal
  • Legal
  • Privacy Policy
  • Imprint

© 2025 WebPros International GmbH

Part of the WebPros®  Family