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Let's Encrypt Certificate Renewal and Shield Matrix Interaction

Advisory Date: October 9, 2025

Users may experience SSL certificate renewal delays in KerioConnect when KerioControl's Shield Matrix blocks Let's Encrypt endpoints that have been flagged by global threat intelligence.

Workaround:

Temporary Solution: Disable Shield Matrix in KerioControl during KerioConnect certificate renewal, then re-enable once renewal completes
Affected Configurations: KerioConnect with KerioControl running Shield Matrix enabled

We're monitoring this behavior to determine whether this represents a change in Let's Encrypt's standard operations. Updates will be provided as the situation develops.

If you need assistance with this workaround, please contact our support team.