What version of Veeam and the plugin are you using?  We need more details than just the error message.  Did you check the logs - C:\ProgramData\Veeam\Backup

Did you check on the forums of the same reported message - https://forums.veeam.com

Did you try Google search as well?

Using 12.2.0.334 plugin for oracle RMAN
Yes - no topics related to specific error

Yes - nothing on google as well.

Two suggestions -

1. Update to 12.3 to see if that fixes the issue.

2. Check the logs in the directory I noted above to see.

Otherwise I would suggest a support ticket to get them to assist.

i’ve checked the logs C:\ProgramData\Veeam\Backup on oracle client and i see below

OracleProxy has been started. PID: [11052]
[17.02.2025 18:18:22.505] < 17528> oralib   |   Communicate with OracleProxy via pipe
[17.02.2025 18:18:22.506] < 18592>          | Thread started.  Role: 'Receiver', thread id: 18592, parent id: 17528.
[17.02.2025 18:18:22.575] < 18592> oralib   | WARN|Failed to read from the data channel!
[17.02.2025 18:18:22.575] < 18592> oralib   | >>  |No data to read.
[17.02.2025 18:18:22.575] < 18592> oralib   | >>  |--tr:Failed to read from the data channel.
[17.02.2025 18:18:22.576] < 18592>          | Thread finished. Role: 'Receiver'.
[17.02.2025 18:18:22.576] < 17528> oralib   | WARN|Failed to receive the answer
[17.02.2025 18:18:22.576] < 17528> oralib   | >>  |No data to read.
[17.02.2025 18:18:22.576] < 17528> oralib   | >>  |--tr:Failed to read from the data channel.
[17.02.2025 18:18:22.576] < 17528> oralib   | WARN| Failed to close proxy process. Oracle SID: XXX.
[17.02.2025 18:18:22.576] < 17528> oralib   | >>  |CCommandTransporter is in stop state
[17.02.2025 18:18:22.576] < 17528> oralib   | >>  |--tr:Failed to send the command [Close]
[17.02.2025 18:18:22.576] < 17528> oralib   | >>  |--tr:Unable to execute the command [Close]
[17.02.2025 18:18:22.576] < 17528> oralib   |   Command transporter destruction...
[17.02.2025 18:18:22.577] < 17528> oralib   |   Closing CPipeDataChannel...
[17.02.2025 18:18:22.577] < 17528> oraplug  | Doing backup of single instance database [XXX] Failed.
[17.02.2025 18:18:22.577] < 17528> plugin_co| ERR |Unable to execute task
[17.02.2025 18:18:22.577] < 17528> plugin_co| >>  |No data to read.
[17.02.2025 18:18:22.577] < 17528> plugin_co| >>  |--tr:Failed to read from the data channel.
[17.02.2025 18:18:22.577] < 17528> plugin_co| >>  |--tr:Unable to execute the command [Init]
[17.02.2025 18:18:22.577] < 17528> plugin_co| >>  |--tr: Failed to create proxy session holder. Oracle SID: XXX.
[17.02.2025 18:18:22.577] < 17528> plugin_co| >>  |--tr:Failed to create OracleProxySessionHolder object.
[17.02.2025 18:18:22.577] < 17528> plugin_co| >>  |--tr:Failed to create oracle proxy session holder. SID: XXX.
[17.02.2025 18:18:22.577] < 17528> plugin_co| >>  |--tr:Unable to run backup for SID [XXX]
[17.02.2025 18:18:22.577] < 17528> plugin_co| >>  |An exception was thrown from thread [17528].
[17.02.2025 18:18:23.096] < 11344>          |     Processing shutdown command.
[17.02.2025 18:18:23.096] < 11344> plugin_co|     Canceling CLI tasks execution
[17.02.2025 18:18:23.097] < 11344> plugin_co|       Stopping current task
[17.02.2025 18:18:23.097] < 17528>          | Thread finished. Role: 'Cli session tasks executor thread'.
[17.02.2025 18:18:23.097] < 11344> oraplug  |       Stopping backup task
[17.02.2025 18:18:23.097] < 11344> oraplug  |         RMAN process has not been started yet
[17.02.2025 18:18:23.097] < 11344> oraplug  |         Backup task has been stopped
[17.02.2025 18:18:23.097] < 11344> oraplug  |       Stopping backup task ok.
[17.02.2025 18:18:23.097] < 11344> plugin_co|     Canceling CLI tasks execution ok.
[17.02.2025 18:18:23.097] < 11344> plugin_co|   Plugin manager stdin loop finished
[17.02.2025 18:18:23.097] < 11344> plugin_co| Dispatching command ok.
 

Ok well there is definitely something wrong so I would suggest opening a ticket with support to have them check the logs more with you for a resolution.

Keep in mind this is just a community website not technical support so we can only suggest things.

Thanks Chris

Not a problem.  Hopefully support helps and you can tell us what the fix or answer is.