For syslog server, please refer to another KB article,
https://comm.support.ca.com/kb/gateway-won-t-start-up-successfully-if-it-cannot-reach-a-syslog-server/kb000074318For external audit sink, after it is enabled, there will be 3 hidden cluster properties to be added to table ssg.cluster_properties,
audit.sink.alwaysSaveInternal
audit.sink.policy.guid
audit.lookup.policy.guid
Login mysql ssg database and remove those properties to disable external audit sink,
1. backup
mysqldump ssg cluster_properties > cluster_properties.sql
2. remove audit properties,
delete from cluster_properties where propkey = 'audit.sink.alwaysSaveInternal';
delete from cluster_properties where propkey = 'audit.sink.policy.guid';
delete from cluster_properties where propkey = 'audit.lookup.policy.guid';
3. start the gateway