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Hi,

Just lately, like over the last 2 weeks only I think, we’ve been getting emailed warnings from our Veeam server. They’re warnings, so do I assume that these eventually complete? Warnings are basically the same theme, as below for example...

Background Removal Job

Failed to remove checkpoints for the backup <JobName> from the repository <S3RepoName>: Amazon S3 External connection has returned an untrusted certificate..
Processing finished with warnings at 21/08/2025 03:00:50


Seems to be almost daily now, early hours of the morning after the VCC jobs have run. Quite annoying to keep getting the emails, annoying to not really understand what it’s really saying here also. I normally take warnings as almost ‘soft fails’ typically there is a retry that works and that’s that?

Thanks in advance for any steer on this.

This Veeam warning means that when it tries to remove checkpoints on the S3 repository, it gets an SSL/TLS certificate it doesn’t trust.

 

Failed to remove checkpoints for the backup <JobName> from the repository <S3RepoName>

Amazon S3 External connection has returned an untrusted certificate.

 

Veeam tried to clean up leftover checkpoints (basically metadata or dangling objects) after a job. When it attempted the cleanup request to your S3 repo, it didn’t like the SSL/TLS certificate returned. This doesn’t usually stop the backup job itself (that’s why it finishes with a warning, not error).

 

A few common causes in the last couple of weeks:

Certificate change/rotation on the S3 endpoint;

Root CA expiration;

Veeam certificate store mismatch – Veeam maintains its own trusted certificate store. If the new CA isn’t in there, you’ll see “untrusted certificate”;

DNS/proxy path change.

 

Confirm the certificate is valid, not expired, and matches hostname, see if the CA is something new/uncommon.

At veeam console:

Console → Menu → Options → Security → Trusted Certificates.

If you are using a custom SSL on your VCC server check if it is expired.  This can happen when it does.

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