Well the first thing I would do is check that all SAS Windows Services are running on all 3 SAS VA servers: 1 - Metadata, 2 - VA App Server and 3- VA Mid-Tier.
If there are no issues there I would be inclined to re-boot the servers. Remember the servers need to be started up in the order shown above (reversing the order for shutdowns), assuming they are separate physical servers. If all 3 SAS servers run on one physical server then just re-boot it and all the services should start in the correct order.
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