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This article is specifically regarding the Veeam Backup & Replication console failing to connect after the Veeam Backup Server's hostname has been changed.
Console connection issues may occur for other reasons and are documented in KB2127.
After changing the hostname of the Veeam Backup Server, the Veeam Backup & Replication Console fails to connect, displaying the error:
No connection could be made because the target machine actively refused it 127.0.0.1. Make sure the backup server you are connecting with is 12.1 version.
The error message displayed by the Veeam Backup & Replication Console mentions a potential version incompatibility because the console assumes that it cannot contact port 9420 because the wrong version is installed. In fact, the reason it cannot reach port 9420 is that the Veeam Backup Service failed to start.
When this occurs, the Veeam Backup Service will be stopped and cannot be started. The diagnostic logging on the Veeam Backup Server will contain the following messages, which show that the server is attempting to connect to the previous hostname.
%programdata%\Veeam\Backup\Svc.VeeamBackup.log:
Info (3) [MSSQL] Connecting to SQL Server (CurrentUser=[NT AUTHORITY\SYSTEM], ServerInstance=[oldhostname\VEEAMSQL2016], Options=[Master], Environment=[Default]) Error (3) [MSSQL] Failed to connect to server oldhostname\VEEAMSQL2016. (Microsoft.SqlServer.Management.Common.ConnectionFailureException) Error (3) [MSSQL] A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (System.Data.SqlClient.SqlException)
To correct this issue, follow the steps below to update the Veeam Backup & Replication configuration to use either localhost or the new hostname:
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