Troubleshooting external authentication issues

When troubleshooting external authentication issues the following log4j loggers are useful:

######### external auth loggers #########
#log4j.logger.org.jasig.cas=DEBUG, stdout, fileout
#log4j.logger.org.springframework.security.providers.cas=DEBUG, stdout, fileout
#log4j.logger.com.jaspersoft.jasperserver.api.security.externalAuth.cas.CasJDBCUserDetailsService=DEBUG, stdout, fileout
#log4j.logger.com.jaspersoft.jasperserver.api.metadata.user.service.impl.UserDetailsServiceImpl=DEBUG, stdout, fileout
#log4j.logger.org.springframework.security=DEBUG ### caution, this will create a 1 MB log file on first login
#log4j.logger.org.springframework.jdbc.datasource=DEBUG, stdout, fileout
#log4j.logger.org.springframework.security.ldap=DEBUG, stdout, fileout
#log4j.logger.com.jaspersoft.jasperserver.api.security.externalAuth=DEBUG, stdout, fileout
#log4j.logger.com.jaspersoft.jasperserver.multipleTenancy.security.externalAuth=DEBUG, stdout, fileout
#log4j.logger.com.jaspersoft.jasperserver.multipleTenancy.ldap=DEBUG, stdout, fileout
#log4j.logger.com.jaspersoft.jasperserver.multipleTenancy.MTDaoAuthenticationProvider=DEBUG
#log4j.logger.com.jaspersoft.jasperserver.multipleTenancy.security.externalAuth.db.MTExternalJDBCUserDetailsService=DEBUG
######### end external auth loggers #########