Connection Issue-error occurred during the pre-login handshake

Hi,
I am facing an issue while connecting to SQL Server. It was working fine but after restarting the SQL server , i am getting the below error. Please help.

Below are the Failure Log

08/13/2021 15:43 Starting job "XXX DB Backup-30Mins " - “Full”. Server “TEST-SERVER”. Account “SYSTEM@WORKGROUP”. App v.“12.5.13”.
08/13/2021 15:43 Connecting to: Unknown. .\SQLEXPRESS.
08/13/2021 15:43 Job execution error: A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.) > An existing connection was forcibly closed by the remote host
08/13/2021 15:43 Job "XXX DB Backup-30Mins " finished with “1” errors.
08/13/2021 15:43 Sending job log to XXX.xxxx@gmail.com.


Success Log

08/12/2021 23:50 Starting scheduled job "XXX_DB Backup-30Mins " - “Full”. Server “TEST-SERVER”. Account “user@XXX-SERVER”. App v.“12.5.13”.
08/12/2021 23:50 Connecting to: SQL RTM Express Edition (64-bit). .\SQLEXPRESS.
08/12/2021 23:50 Running SQL script before backup.
08/12/2021 23:50 SQL script has finished successfully.
08/12/2021 23:50 The temporary folder “E:\ Application\DB Backups\SQLBackupFTP Temp FOlder\Pranas.NET\SBF\b339981b-6253-4c96-a0fa-7435b0a4de8b\backup” has “462.27GB” free space.
08/12/2021 23:50 Backing up “.\SQLEXPRESS” SQL Server databases.
08/12/2021 23:50 Backing up “XXX_DB” with “Full” backup type.
08/12/2021 23:50 Database “XXX_DB” successfully backed up to “E:\TEST Application\DB Backups\SQLBackupFTP Temp FOlder\Pranas.NET\SBF\b339981b-6253-4c96-a0fa-7435b0a4de8b\backup\XXX_DB202108121950.bak : 15.476MB”.
08/12/2021 23:50 Compressing “E:\TEST Application\DB Backups\SQLBackupFTP Temp FOlder\Pranas.NET\SBF\b339981b-6253-4c96-a0fa-7435b0a4de8b\backup\XXX_DB202108121950.bak” file with Internal archiver. Encryption: “Off”.
08/12/2021 23:50 Backup of “XXX_DB” successfully compressed to “(XXX_DB202108121950.zip : 2.225MB)”.
08/12/2021 23:50 Connecting to “Folder” destination “E:\TEST Application\DB Backups\SQLBackupFTP”.
08/12/2021 23:50 Reading folder information by path: “E:\TEST Application\DB Backups\SQLBackupFTP”.
08/12/2021 23:50 The current destination folder is “E:\TEST Application\DB Backups\SQLBackupFTP”.
08/12/2021 23:50 Sending backup of “XXX_DB” to “Folder” destination “E:\TEST Application\DB Backups\SQLBackupFTP”.
08/12/2021 23:50 Uploading local “XXX_DB202108121950.zip” to remote “XXX_DB202108121950.zip” in folder “E:\TEST Application\DB Backups\SQLBackupFTP”.
08/12/2021 23:50 Uploaded 100.00 % (average speed = 371.98 MB/s).
08/12/2021 23:50 Verifying remote file “XXX_DB202108121950.zip” with local one “XXX_DB202108121950.zip”.
08/12/2021 23:50 Cleaning up backups of "XXX_DB DB Backup-30Mins " job.
08/12/2021 23:50 Cleaning up backups of “XXX_DB” database at “Folder” destination “E:\TEST Application\DB Backups\SQLBackupFTP”.
08/12/2021 23:50 Cleaning up “E:\TEST Application\DB Backups\SQLBackupFTP” folder.
08/12/2021 23:50 Deleting old backup of “XXX_DB”. Backup type: “Full”. Backup time: “08/10/2021 19:05:04”. Files: ““XXX_DB202108101905.zip””.
08/12/2021 23:50 XXX_DB202108101905.zip not found on the destination.
08/12/2021 23:50 Cleanup of “XXX_DB” completed.
08/12/2021 23:50 Running SQL script after backup.
08/12/2021 23:50 SQL script has finished successfully.
08/12/2021 23:50 Disconnecting from “Folder” destination “E:\TEST Application\DB Backups\SQLBackupFTP”.
08/12/2021 23:50 Job "XXX_DB DB Backup-30Mins " finished.


The difference which i can see in the both log is first and second line.I can see the account as "“user@XXX-SERVER” in success log but failed log it showing as “SYSTEM@WORKGROUP”.

Please help me on this issue.

Hi DEVARAJ,

Could you please try to connect via SSMS? If the connection can be set successfully, please let us know the version of your SQL Server.

Sorry for the inconvenience.