Reattach Central Admin Server to SharePoint Farm

If you detach Central Admin server from SharePoint Farm accidentally, follow below steps to reattach the server to Farm.

1. Execute the following powershell command first, to connect the server to existing farm
   Connect-SPConfigurationDatabase -DatabaseServer “<$DatabaseServer>” -DatabaseName “<$RunSettings.ConfigurationDatabaseName>” -Passphrase “<$Passphrase>”
   Connect-SPConfigurationDatabase -DatabaseServer “Server000”-DatabaseName “Database_SharePoint_Config” -Passphrase enterPassPhrase
2. Run the configuration wizard add select existing farm.

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