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Certificate verification warning when backing up VM's

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Since upgrading to version 11.5 my logs show this warning:
VMware_VDDK: SSL_VerifyX509: Certificate verification is disabled, so connection will proceed despite the error

It logs multiple times during the backup of the VM and occurs for every VM being backed up.

I am on the latest build of 11.5.37608. This warning does not stop a successful backup but it would be nice to find out how to correct problem. Any suggestions?

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Hello Scott Lane,

Thank you for posting this question in our forum. I am happy to assist you. 

The message "VMware_VDDK: SSL_VerifyX509: Certificate verification is disabled" means that you have invalid ssl certificates at your esx environment. There is an external blog entry, that might help to fix this issue. If you need additional assistance in this special situation, please contact the VMware support.

If there is anything else I can do for you, please let me know.

Thank you.