Seen a number of posts about this sort of issue...don't get why it seems to happen regularly. Atlassian - looks like something you need to fix? from us-west-1
[root@ip-10-35-12-70 bamboo]# /opt/bamboo-elastic-agent/bin/bamboo-elastic-agent
Syncing Elastic Bamboo Agent files...
2015-12-13 04:30:22,812 INFO [main] [S3Sync] Syncing from: bamboo-agent-release-us-w1/5.9.7/b3f798e03f020d72f10564280b47840ba203ae32/ to /opt/bamboo-elastic-agent
2015-12-13 04:30:24,521 INFO [main] [S3Synchroniser] Syncing s3://bamboo-agent-release-us-w1/5.9.7/b3f798e03f020d72f10564280b47840ba203ae32/ to /opt/bamboo-elastic-agent
2015-12-13 04:30:24,536 INFO [main] [AmazonClients] Detecting bucket location for [bamboo-agent-release-us-w1]
2015-12-13 04:30:25,812 WARN [main] [AmazonClients] Unable to get bucket location for [bamboo-agent-release-us-w1], using default. Error: com.amazonaws.services.s3.model.AmazonS3Exception: Access Denied (Service: Amazon S3; Status Code: 403; Error Code: AccessDenied; Request ID: 0551DDC8AC66E08A), S3 Extended Request ID: vufOZs1Jw7DKEKq2bwAT6bnE/ZUPQFdI+7jtK7ITL9jLTCuV9GhBZwUXvPa6Q8TCLrSUvhc+7lc=
2015-12-13 04:30:25,812 INFO [main] [S3Synchroniser] Fetching the list of remote objects...
Exception in thread "main" com.amazonaws.services.s3.model.AmazonS3Exception: Access Denied (Service: Amazon S3; Status Code: 403; Error Code: AccessDenied; Request ID: B8E6EC6AF92964D7), S3 Extended Request ID: sic01W4ilb9JpvxXGb/hpsM6oBtqNjc7fmRwCildB9PLnKgMYHJvOvwviiuyySv0Pxo0E8+K0fA=
at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:1182)
at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:770)
at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:489)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:310)
at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3604)
at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3557)
at com.amazonaws.services.s3.AmazonS3Client.listObjects(AmazonS3Client.java:647)
at com.amazonaws.services.s3.AmazonS3Client.listObjects(AmazonS3Client.java:632)
at com.atlassian.aws.s3.S3Synchroniser.getObjectNamesAndHashes(S3Synchroniser.java:341)
at com.atlassian.aws.s3.S3Synchroniser.sync(S3Synchroniser.java:163)
at com.atlassian.bamboo.agent.elastic.S3Sync.sync(S3Sync.java:72)
at com.atlassian.bamboo.agent.elastic.installer.ElasticAgentInstaller.install(ElasticAgentInstaller.java:76)
at com.atlassian.bamboo.agent.elastic.installer.ElasticAgentInstaller.main(ElasticAgentInstaller.java:173)