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Problem

NAV server unable to start again, this is happening in some version of NAV server using SQL authentication to connect to database. 
In "Event Viewer", the error message is unable to connect to database due to authentication failed or encryption key problem.

Solution

It is due to the SQL authentication key has changed if multiple server instance using SQL authentication, prefer using Windows Authentication in this case.
However, if that is not feasible, please following the instruction below to re-create the server authentication key


  1. Go to folder %programdata%\Microsoft\Microsoft Dynamics NAV\100\Server\Keys (where 110 is the version of your NAV server, which can be vary)
  2. Delete the server_name.key file of your server instance
  3. Go to Dynamics NAV 2017 Administrator > Your Server Instance > Database Credentials


  4. Enter your database authentication, the encryption key should be generation again


  5. Try to start server again

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