Well the ‘red connected’ you are talking about is not related to SQL Server, but the messaging server I think. So basically you will still be able to access the database, the menu the product and everything, however each terminal won’t detects changes unless you manually refresh it.
For example,
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you have Terminal A for taking order, and Terminal B for Kitchen Display
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Both are ‘red connected’ I.e. ‘Not connected to messaging server’
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When Terminal A Creates ticket order for table X, Terminal B will not notice the order, and shows blank on kitchen display entity screen
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So you have to either manually refresh the kitchen display to see the ticket (via locking out, or clicking entity tab, etc.), or you can set ticket lister widget to self refresh every x seconds
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If both terminal got the ‘Green connected’ however, then it automatically detects this change, and you don’t need to do the above.
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This assumes the ‘red-colour connected’ text indeed is ‘red-colour not connected’ text, otherwise I don’t know lol
Also see this for better explaination of messaging server