Konica Minolta IEEE 802.1X Error 5
The printer and authentication network could not agree on an EAP method.
Error meaning
EAP method negotiation failed.
This meaning is tied to the reviewed family/platform and subsystem below; do not reuse the number or wording by itself on a different printer family or protocol.
Applies to
bizhub C287/C227
- bizhub C287
- bizhub C227
Common formatting
These are formatting/lookup aliases for this reviewed condition, not separate error pages.
- 5
- ieee8021x-5
What usually causes it
- The printer is configured for one EAP method while the RADIUS or wireless policy requires another.
- An enterprise Wi-Fi profile was changed from PEAP to certificate-based EAP, or the reverse.
- The server is offering only methods that are disabled or unsupported in the printer's current profile.
What to try
Identify the EAP method required by the network
Ask the administrator whether this device should use PEAP, EAP-TLS, or another supported enterprise authentication method.
Compare that method with the printer profile
Open the C287/C227 IEEE 802.1X settings and confirm the selected EAP type matches the network policy exactly.
Do not troubleshoot passwords before negotiation succeeds
A credential can be correct and still fail if the EAP method itself does not match. Fix the method mismatch first.
Reconnect and review authentication logs
After correcting the EAP selection, retry the connection and check the RADIUS log if the network still rejects the session.
After each corrective action
Retry the same operation that produced 5. If it now works, stop there rather than changing unrelated printer, network, supply, or service settings.
If the code returns
If code 5 returns with the expected EAP method selected, the network administrator should inspect the RADIUS policy and supported method list for this device or port.
When service may be needed
There is no reason to open the printer for an EAP negotiation failure. Escalate to network administration or vendor support if the device and server appear to advertise matching methods.
Continue with guided troubleshooting
If the printer still is not working after the reviewed checks, carry this verified error context into the guided troubleshooter.
Related information
Verified source
Official Konica Minolta product-family user guide. Candidate meanings are paraphrased from protocol-specific code tables; manufacturer prose must not be copied into public pages.