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Cannot connect to IMAP server using MS Outlook: Socket error: 10061, Error Number: 0x800ccc0e

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Taras Ermoshin
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Plesk Onyx for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk Onyx for Linux

Symptoms

  • IMAP connection to a Plesk server using MS Outlook does not work after Debian dist-upgrade:

    PLESK_ERROR: The connection to the server has failed. Account: ‘your_account’, Server:’your_SMTP_server’, Protocol: SMTP, Port: 25, Secure (SSL): NO, Socket error: 10061, Error Number: 0x800ccc0e

  • The following error can be found in the file /var/log/syslog:

    CONFIG_TEXT: plesk.example.com dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip= 203.0.113.2 , lip= 203.0.113.3 , TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:SSL3_READ_BYTES:sslv3 alert certificate unknown: SSL alert number 46, session=<sKc5E7VZXlVtWyft>

  • SSH connection or access to Plesk administrative panel is temporarily blocked.

  • Fail2Ban is enabled and IP address of your workstation can be found in /var/log/fail2ban.log :

    CONFIG_TEXT: fail2ban.filter [2202]: INFO [plesk-dovecot] Found 203.0.113.2
    fail2ban.filter [2202]: INFO [plesk-dovecot] Found 203.0.113.2
    fail2ban.filter [2202]: INFO [plesk-dovecot] Found 203.0.113.2
    fail2ban.filter [2202]: INFO [plesk-dovecot] Found 203.0.113.2
    fail2ban.actions [2202]: NOTICE [plesk-dovecot] Ban 203.0.113.2
    fail2ban.filter [2202]: INFO [recidive] Found 203.0.113.2
    fail2ban.filter [2202]: INFO [plesk-postfix] Found 203.0.113.2
    fail2ban.filter [2202]: INFO [plesk-postfix] Found 203.0.113.2
    fail2ban.actions [2202]: NOTICE [plesk-postfix] Ban 203.0.113.2
    fail2ban.filter [2202]: INFO [recidive] Found 203.0.113.2

Cause

Fail2ban is blocking connections to the server.

Resolution

  1. Log into Plesk.

  2. Go to Tools & Settings > Mail Server Settings.

  3. Check what is specified in the field Installed IMAP/POP3 server: Dovecot or Courier-IMAP.

  4. Go to Tools & Settings > IP Address Banning (Fail2Ban) > Jails.

  5. Click on plesk-dovecot or plesk-courierimap, depending on the used IMAP/POP3 server found in step 3.

  6. Click Change Settings.

  7. Adjust the parameters IP address ban period and The maximum number of failed login attempts: increase the number of failed attempts and/or the ban period.

Also, if the customer affected by the issue uses the permanent IP address, consider adding it to Trusted IP Addresses in Tools & Settings > IP Address Banning (Fail2Ban).

Comments

2 comments

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    David Jones

    It is very common error 0x800CCC0E message when configuring an email account in Outlook and trying to send an e-mail. To resolve this error, you can follow manual process. The inbuilt utility like ScanPST.exe tool are an effective way to resolve most of the MS Outlook errors. If this method is not able to resolve this issue then one can try using Outlook PST repair tool to retrieve your valuable data. The PST recovery tool is designed with an advanced engine that can resolve any MS outlook issues with few simple clicks of the mouse.
    Get more info here:- datarepairtools.com/blog/fix-imap-error-0x800ccc0e-in-outlook




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  • Avatar
    Ivan Postnikov

    Hi @David, thank you for sharing!

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