If you are using the YubiCloud validation service for validating the OTPs, please verify you have configured the correct Client ID and corresponding API Key in your YRVA settings (the following steps use a pre-created Client ID and API key that can work but for security reasons we recommend you to create a new Client ID and API key by visiting link
https://upgrade.yubico.com/getapikey/):
a) In the YRVA Webmin console, navigate to Global Configuration >> Validation Server and select the YubiCloud-Online Validation Service
b) Set the Client ID: 4233 (or your Client ID)
c) API key: 'H9xX7BeTIbhYK3xCb/PSEeRVNvY=' (without quotes) (or the API key corresponding to your Client ID)
If the problem still persists, please configure the log files, make a few authentication attempts and send the log files to [url]support@yubico.com[/url]along with the following details:
1) Version of the YubiRADIUS virtual appliance (YRVA) you are using
2) The OTP validation server you have configured i.e. YubiCloud or on-board OTP validation server in YRVA
To enable logging, following these steps:
I. Login to webmin console for YubiRADIUS
II. Go to "System" >> "System Logs"
III. Click on log file (ykropval, etc. mentioned below)
IV. Select "all" option in "priorities" field of "Message types to log" section
V. Please click on "save" button to save the changes.
VI. Please repeat step 3, 4 and 5 for other log files mentioned below.
VII. Please click on "Apply Changes" button on System Logs page
VIII. Go to "Servers" >> "YubiRADIUS Virtual Appliance"
IX. Navigate 'Global Configuration' >> 'FreeRADIUS' menu, please enable FreeRADIUS Logging
X. Could you please ssh to the YRVA instance and restart the rsyslog process by executing the following command:
/etc/init.d/rsyslog restart
XI. Please try to reassign and test the user with YubiKey credentials.
Please send the following log files to [url]support@yubico.com[/url]
/var/log/syslog
/var/log/messages
/var/log/ykval.log
/var/log/ykropval.log
/var/log/ykmap.log
/var/log/freeradius/radius.log
Thanks!
Samir.