Wsus not updating

Hi I have a test rig. The wsus server is online and we export the files and database to three separate. But identical rigs
Two work.
The other one remains at downloading updates for many days.

The permissions are the same. It’s the same database etc

Also if I rebuild the box it works fine with that export just won’t update next time

Any ideas ?

Windows 2012 r2
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Mike HammerAsked:
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Mike HammerAuthor Commented:
Import log shows no errors I can see the new files in the log

Nothing in eventviewer.  

All files are present in correct locations

Still not down loading
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