Tenable Nessus Scanner Statuses

You can view the status for scanners, as described in View Your Nessus Scanners.

Status	Description	Recommended Action
Authentication Error	Tenable Security Center could not authenticate to the scanner using the credentials you provided.	Check your scanner configuration settings and confirm the Username and Password options specify valid login credentials for the scanner.
Certificate Mismatch	Tenable Security Center could not confirm the validity of the SSL certificate presented by the scanner.	Do one of the following: Edit your scanner configuration and select a different authentication type. (Tenable Nessus scanners only) Check your scanner configuration settings and confirm the Certificate option specifies the correct nessuscert.pem file. For more information about managing SSL certificates in Nessus, see Manage SSL Certificates in the Tenable Nessus User Guide.
Connection Error	Tenable Security Center cannot connect to the scanner because the scanner is unreachable or does not exist at the IP address or hostname provided.	Do one or both of the following: Check your scanner configuration and confirm the Host option specifies the correct IP address or hostname for the scanner. Confirm the network devices and firewalls between Tenable Security Center and the scanner are configured to permit network traffic.
Connection Timeout	Tenable Security Center connected to the scanner but timed out waiting for a reply.	Contact your network administrator for troubleshooting assistance.
Invalid Configuration	The scanner attempted to connect to a scanner on port 0, or the provided API key is for a scanner that does not support agent scans.	Do one or both of the following: Check your scanner configuration and confirm the Port option specifies a valid TCP port to connect to your scanners. For more information, see Port Requirements. Check your scanner configuration and confirm the Access Key and Secret Key options specify valid keys for a Tenable Nessus Manager or cloud scanner.
Permission Error	The provided API keys do not have the correct permissions to run agent scans.	Check your scanner configuration and confirm the Access Key and Secret Key options specify valid keys for the scanner.
Plugins Out of Sync	The plugin sets on the scanner do not match the plugin sets in Tenable Security Center.	For troubleshooting assistance, see the knowledge base article.
Protocol Error	Tenable Security Center connected to the scanner but the scanner returned an HTTPS protocol negotiation error.	Contact your network administrator for troubleshooting assistance.
Reloading Scanner	The scanner is temporarily unable to run scans because Tenable Nessus is restarting on the scanner.	None.
Updating Plugins	Tenable Security Center is performing a plugin update on the scanner.	You may want to schedule plugin updates to run a few hours before your scheduled scans. For more information, see Edit Plugin and Feed Settings and Schedules. If a scanner has a persistent Updating Plugins status, the plugin update have been interrupted. For troubleshooting assistance, see the knowledge base article.
Updating Status	Tenable Security Center is refreshing the status of the scanner. Scanners can continue to run scans while Tenable Security Center refreshes the status. Note: Tenable Security Center automatically refreshes scanner statuses every 15 minutes. If you create a new scanner, edit a scanner, or manually refresh the status using the Update Status option, Tenable Security Center refreshes the status of the scanner on demand.	None.
Upgrade Required	The version of Tenable Nessus on the scanner is unsupported and requires an upgrade. Tenable Security Center cannot perform scans with or update plugins for scanners running unsupported versions of Tenable Nessus. For minimum Tenable Nessus scanner version requirements, see the Tenable Security Center Release Notes for your version.	Upgrade to a supported version of Tenable Nessus, as described in Upgrade Nessus in the Tenable Nessus User Guide.
User Disabled	A Tenable Security Center user disabled the scanner.	Edit your scanner configuration and click the Enabled toggle to re-enable the scanner. For more information about scanner options, see Tenable Nessus Scanners.
Working	The scanner is connected to Tenable Security Center and able to run scans.	None.