Overview
You may encounter a scenario where manual port speed configuration is not available on KerioControl NG appliances with Intel 2.5G network interfaces. Attempting to change port speed settings will display the following warning:
“The driver for this interface supports Auto Negotiation only”
Solution
Cause
The Intel 2.5G driver included in Kerio Control v10 does not support manual speed/duplex configuration. This is a driver limitation, not a KerioControl software issue.
The warning message was intentionally added by GFI engineering to clearly inform administrators of this limitation rather than silently failing.
Troubleshooting: Disconnected Slave Ports
If you are experiencing "disconnected" slave ports on your NG appliance, do not attempt to resolve this by manually setting port speed — this will not work due to the driver limitation above. Instead, check the following:
|
Check |
Action |
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Physical cabling |
Inspect and reseat all network cables |
|
Switch port config |
Ensure auto-negotiation is enabled on the connected switch port |
|
Switch compatibility |
Verify the switch supports 2.5G or multi-gig link speeds |
Resolution
Current Workaround:
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Ensure all connected switches and routers are set to auto-negotiate
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The Intel 2.5G NIC will automatically negotiate the optimal link speed — no manual override is needed
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Speed settings established via auto-negotiation persist after reboot
Future Updates:
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GFI Engineering is actively tracking Intel driver updates
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Once Intel releases a driver version supporting manual speed configuration, it will be incorporated into a future Kerio Control v10 release
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No ETA is currently available
Important Notes
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This limitation affects all Kerio Control NG series appliances equipped with Intel 2.5G NICs
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This is not a bug — the warning message is by design
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Legacy NG appliances with standard 1G Intel NICs are not affected by this limitation
Andriy Rybalchenko
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