Technical Tip: Nessus process keeps restarting after configuring captive network assistant

This article discusses a behavior where the appliance's Nessus process constantly restarts.  Behavior occurs after configuring the Captive Network Assistant.

The following (or similar) error message is printed in /bsc/logs/output.nessus:

yams INFO :: 2022-01-05 14:01:49:540 :: loaderReady WebServiceDefinitionManager 1.0
yams.WebServiceDefinitionManager INFO :: 2022-01-05 14:01:49:547 :: Current Version is 3
yams SEVERE :: 2022-01-05 14:01:49:587 :: java.lang.IllegalArgumentException: Whitespaces may not be used in a LiteralDeclaration. They define multiple declarations and a MultipartDeclaration should be used.
yams SEVERE :: 2022-01-05 14:01:49:587 :: at com.bsc.portal.apache.decl.LiteralDeclaration.setContents(LiteralDeclaration.java:21)
yams SEVERE :: 2022-01-05 14:01:49:587 :: at com.bsc.portal.apache.decl.LiteralDeclaration.(LiteralDeclaration.java:9)
yams SEVERE :: 2022-01-05 14:01:49:587 :: at com.bsc.portal.apache.stmt.DeclarationStatement.addArgument(DeclarationStatement.java:39)
yams SEVERE :: 2022-01-05 14:01:49:587 :: at com.bsc.portal.apache.stmt.DeclarationStatement.(DeclarationStatement.java:28)
yams SEVERE :: 2022-01-05 14:01:49:587 :: at com.bsc.plugin.portal.WebServiceDefinitionManager.buildApacheConfiguration(WebServiceDefinitionManager.java:189)
yams SEVERE :: 2022-01-05 14:01:49:587 :: at com.bsc.plugin.portal.WebServiceDefinitionManager.deployWebServices(WebServiceDefinitionManager.java:105)
yams SEVERE :: 2022-01-05 14:01:49:587 :: at com.bsc.plugin.portal.WebServiceDefinitionManager.loaderReady(WebServiceDefinitionManager.java:63)
yams SEVERE :: 2022-01-05 14:01:49:587 :: at com.bsc.server.Yams.readyPlugins(Yams.java:1131)
yams SEVERE :: 2022-01-05 14:01:49:587 :: at com.bsc.server.Yams.start(Yams.java:673)
yams SEVERE :: 2022-01-05 14:01:49:588 :: at com.bsc.server.Yams.main(Yams.java:4689)

This is an indication that there is an error in the Web Service Definition setting.

1)  Review the Web Service Definition settings.

For instructions, see section 'Enable CNA (iOS/macOS/Samsung Android)' in the following KBarticle.

https://fortinetweb.s3.amazonaws.com/docs.fortinet.com/v2/attachments/b0560ae0-08a9-11eb-96b9-00505692583a/Enable_Captive_Network_Assistant.pdf

2)  Ensure there are no errors in the URLs or extra spaces.

3)  Once edit are complete, select 'OK' to save and press Publish to write the changes.