Veeam backup keeps failing SQL backup, "Failed to prepare guest for hot backup..."

Veeam 7 is continually failing with a different error every day backing up a group of servers. Yesterday is was a critical SQL server with the following message:
"Failed to prepare guest for hot backup. Error: VSSControl: Failed to prepare guest for freeze, wait timeout 900 sec"
Any suggestions/resolutions? As this is urgent! Thanks!!
admitechAsked:
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gheistCommented:
There is nothing urgent in daily backup. You keep original even backup fails

Can you post authentic message from error log?
Maybe you need to reinstall vmware tools with volume manager and vss services running.
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admitechAuthor Commented:
This is authentic. Had to change the timeout in the registry for VSS. All is well
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gheistCommented:
Delete this then. I was waiting for windows log entry....
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admitechAuthor Commented:
Set VSS timeout in registry. Increased from 200 to 800
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