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Kerio Connect 10.0.9 Release Notes

Overview

Kerio Connect 10.0.9 (build 9754) has been released and is available for download:

  • Release date: 2026-03-25
  • Build ID: 9754

Changes in this release

  • Resolved agent log locking issue
  • Fixed a regression with default email signatures not saving in Outlook Connector (Remove and Recreate the Profile)
  • Implemented TCP fallback for truncated DNS responses
  • Resolved misleading 2FA cookie token verification error messages
  • Fixed security issue where allowed relay IPs bypass spam filtering
  • Enhanced licensing enforcement during Active Directory synchronization
  • Prevented GFI Agent from auto-enabling after upgrades
  • Improved SMIME certificate handling for encrypted messages
  • Fixed calendar file (.ics) preview encoding in Outlook Connector - (Remove and Recreate the Profile)
  • "All Folders" Search feature fixed in New Connect UI
  • Removed Kerio Connect Nano
  • Enhanced Exchange Web Services (EWS) compatibility for third-party clients, fixing the following:
    • Error 108: "Not implemented only CategoryList configuration is supported" (GetUserConfiguration)
    • Error 339: "Only traversal type Shallow is supported" (FindItem)
    • Error 339: "Unsupported restriction type" (Filtering Operations)
  • Added RFC 8058 compliance by including List-Unsubscribe headers in DKIM signatures for one-click unsubscribe support
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  1. Ciprian Nastase

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Comments

  1. Marc Müller

    The 10.0.9 p1 release fixed the backup problem. Thank you!

  2. Andreas Stofleth

    I think it's time to change, every update is just a problem.

  3. Marc Müller

    It seems like the 10.0.9 release has been withdrawn instead of providing a fix.

  4. Andreas Stofleth

    After upgrading to 10.0.9 this entry appears daily in the error log:

    TelemetryUpdate.cpp: Telemetry update failed (6): Couldn't resolve host name

  5. Helge Schmitz

    After upgrading to 10.0.9 my Kerio server crashing all the time. 

  6. Ralf Behrend

    UPDATE: Calendar makes the mailserver.exe crashing. Mailserver.exe seems to be the problem in the background - please provide a fix!

  7. Ralf Behrend

    My server crashes several times a day - it is anoying!

  8. Rusty Bourque

    After upgrading to 10.0.9, My Kerio Connect server is also crashing daily, as well as ActiveSync issues.  Should I go back to 10.0.8?

  9. Nicolas Paul

    Hello, I'm having the same problems: Kerio Connect crashes and ActiveSync doesn't work properly... Have you found a solution? Will there be a fix?


  10. Hanspeter Tinner

    I am running 10.0.8p2 and the upgrade function is not working, ismsay no new version is available !! after installing 10.0.9 manually, server was crashing all the time, so i had to go back to 10.0.8p2. Whats going wrong  with 10.0.9 ?!?!