I have a SharePoint 2013 server that backs up just fine under DocAve using credentials that have admin access to both the server and the database. When I try to back it up under BE15, the job cannot authenticate with the Configuration database when I try a SharePoint farm backup even though it connects with the other SharePoint databases. The agent is up to date. The standard backup as a file server works though.
Yes, it has farm admin access and db_owner in SQL. Its quite a curious problem I've analyzed the SQL and windows logs to no avail as to why it happens. I do notice when I'm editing the job and I drill down into the Sharepoint resources eventually It will give me an authentication error and ask to try with another account, even though I know it has full access. DocAve breezes through the backups with no issues whatsoever.