persistence - SQL Server Workflow Peristence is configure d with a non-existent store: bogus message, cannot solve -

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so i've had windows workflow persistence enabled , has been month now. morning, things came crashing down error below. problem is, persistence store has been configured , working (in sql server). absolutely nothing has changed. database persistence information stored still there , healthy. can find no problems database itself. no matter do, list of available servers should show in "sql server store" dropdown remains empty.

it gets worse. error isn't restricted 1 server. has happened organization-wide on several machines (we're using appfabric persistence enabled on multiple servers here). we've tried creating new databases on different servers running separate instances of sql server--same result. our theory, such is, microsoft pushed out strange update via automatic updates overnight.

clues, anyone? tia enter image description here


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