# \[Action Required\] CRITICAL Issue Advice MWA-2021-0001

**URL:** <https://forum.moonwalkinc.com/t/action-required-critical-issue-advice-mwa-2021-0001/97>\
**Category:** Announcements\
**Tags:** mwa\
**Created:** [November 24, 2021, 4:59am UTC](https://forum.moonwalkinc.com/t/action-required-critical-issue-advice-mwa-2021-0001/97 "2021-11-24T04:59:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Edward](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.moonwalkinc.com/edward/32/32_2.png) [@Edward](https://forum.moonwalkinc.com/u/Edward)\
**Post date:** [November 24, 2021, 4:59am UTC](https://forum.moonwalkinc.com/t/action-required-critical-issue-advice-mwa-2021-0001/97/1 "2021-11-24T04:59:29Z")

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### SUMMARY

A potential data loss issue has been discovered when using incorrectly configured policies against S3 destinations.

### SEVERITY

This issue has been classified as critical. Even though many users will not be affected at this time, product misconfiguration results in data loss.

### VERSIONS AFFECTED

12.12 to 12.12u3 inclusive

### DETAIL

This issue pertains **only** to:

- _Change Destination Tier_ and _Retarget Destination_ Policies
- Using S3 as the Policies’ _New Destination_
- Where the _New Destination_ bucket is configured to use the _Migrate with original filenames_ option

Normally, the configuration described above is not permitted - Change Destination Tier and Retarget Destination Policies are immediately terminated with an appropriate error when attempted against such buckets. This is advised in the GUI when switching the bucket layout configuration to the (non-default) _Migrate with original filenames_ option: such buckets “_may not be used as the new destination for Change Destination Tier or Retarget Destination Policies._”

If a Change Destination Tier or Retarget Destination Policy is incorrectly configured to move data to a _Migrate with original filenames_ bucket, in **some cases** the logic to terminate the policy will fail. Instead, the policy will process these files incorrectly, leading to undesirable behaviour including data loss.

### DETECTION

Check in agent.log on all S3 Gateway Servers for a message similar to the following:

```auto
2021-11-23 14:15:41.237 (GMT+10:00) <Q04> ERROR: uncombined error: 
[0] ERR_DMSTREAMAMAZONS3_CREATEALWAYSOVERWRITE_FAILED [ERR_ADD_OPERATION_NOT_PERMITTED_FOR_DEST_CONFIG] [Bucket 'my-bucket' is configured to 'Migrate with original filenames']

```

The presence of this error (including the ‘uncombined error’ line) indicates the incorrect processing of a file. Contact Moonwalk **immediately** should you encounter this issue.

### FIX

This issue will no longer occur once the software is [updated to 12.12u4 or later](https://forum.moonwalkinc.com/t/critical-software-update-moonwalk-12-12u4-released).

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<div class="post-metadata">

**Author:** ![Edward](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.moonwalkinc.com/edward/32/32_2.png) [@Edward](https://forum.moonwalkinc.com/u/Edward)\
**Post date:** [November 25, 2021, 1:47am UTC](https://forum.moonwalkinc.com/t/action-required-critical-issue-advice-mwa-2021-0001/97/2 "2021-11-25T01:47:42Z")

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