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Horde login failed on Plesk for Linux: Could not open secure TLS connection to the IMAP server

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Nelson Leiva
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Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

  • Horde webmail login failed with the following message:

    Message Login failed.

  • Log /var/log/psa-horde/psa-horde.log contains the following error:

    CONFIG_TEXT: WARN: HORDE [imp] [login] Could not open secure TLS connection to the IMAP server. [pid 35439 on line 732 of "/usr/share/psa-horde/imp/lib/Imap.php"]
    ERR: HORDE [horde] FAILED LOGIN for john.doe@example.com (john.doe@example.com) [203.0.113.2] to horde [pid 35439 on line 216 of "/usr/share/psa-horde/login.php"]

  • gnutls library is installed on the server:

    • On CentOS:

      # rpm -qa | grep gnutls
      gnutls-2.8.5-4.el6.x86_64

    • On Debian\Ubuntu:

      # dpkg -l | grep gnutls
      ii gnutls-bin 3.4.10-4ubuntu1.4

Cause

OS PHP interoperability issue with GNU TLS library.

Resolution

Note: This article may require additional administrative knowledge to apply. If any help required, contact the server’s administrator or hosting support.

Make sure the latest version of GNU TLS library is installed.

Alternatively, apply the following workaround:

  1. Login to the server via SSH.

  2. Create a backup of the Horde configuration file:

    # cp -a /usr/share/psa-horde/imp/config/backends.php{,.bak}

  3. Open file /usr/share/psa-horde/imp/config/backends.php with a text editor and change the IMAP configuration in Horde webmail by editing the lines:

    From:

    CONFIG_TEXT: 'port' => 143
    ...
    'secure' => 'tls'

    To:

    CONFIG_TEXT: 'port' => 993
    ...
    'secure' => 'ssl'

  4. Make sure that the final configuration for IMAP server looks like below in /usr/share/psa-horde/imp/config/backends.php file:

    CONFIG_TEXT: $servers['imap'] = array(
    // ENABLED by default; will connect to IMAP port on local server
    'disabled' => false,
    'name' => 'IMAP Server',
    'hostspec' => 'localhost',
    'hordeauth' => false,
    'protocol' => 'imap',
    'port' => 993,
    ...
    'secure' => 'ssl',
    );

 

Comments

3 comments

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  • Avatar
    Dan Wright

    I have implemented these changes and rebooted a couple times, but still the same exact error. I am using CentOS 7 and the latest Plesk and yum updates.

     

    # rpm -qa | grep gnutls
    gnutls-3.3.26-9.el7.x86_64

     

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  • Avatar
    Dan Wright

    I need to add. I am not receiving this error upon login. I am able to log in and retrieve emails just fine. I see the error upon attempting to SEND emails in horde.

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    Alexandr Bashurov

    @Dan Wright

    Seems like this article is not applicable for the case, as IMAP connection works correctly.

    I can suggest checking /var/log/psa-horde/psa-horde.log, /var/log/maillog for any errors happening during the SMTP transaction and then searching our Knowledge Base for a fitting article.

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