Unable to Connect We encountered an error while trying to connect. Details: "An error happened while reading data from the provider: 'Could not load file or assembly 'System.EnterpriseServices, Ver...
Found this thread as was experiencing a similar issue
The resolution I found was that the user had saved the credentials used to connect to the database directly rather than carrying those in the connection from the machine they are logged into.
The user had on the day the issue started, updated their password.
Going into the connection settings and either updating these credentials or setting it to pick them up automatically solved the issue.