Transporter Connection Lost

Product version: 11.0

Last modified: 15 September 2025

Problem

During backup jobs, when the source transporter cannot connect to the target transporter, the following error message is displayed in logs:

sourceTransporter=TransporterHostInfo{name='Esx1', host='10.1.1.62', port=9446, 9448-10000, maxLoad=10, username='null',

loggingLevel='DEBUG', password=[[*********]], key=[[*********]],

fingerprint='targetTransporter=TransporterHostInfo{name='10.2.1.253', host='10.2.1.253',

port=9446, 9448-10000, maxLoad=10, username='null', loggingLevel='DEBUG', password=[[*********]], key=[[*********]],

[ERROR][Events] [SYSTEM] [JOB-1/Backup S-FILES02][VM-115/S-FILES02] error13: EventError13{jobInfo='EventJobInfo

{jobId=1, jobExecutionId=null, jobScheduleName=null}', title='Backup of the "S-FILES02" VM has failed',

description='Connection to the "{ type: "itemlink", vid: "TRANSPORTER-4", text: "10.2.1.253" }" transporter has been lost.

Make sure the transporter is available and the connection to this transporter can be established.', transient='null'}

[INFO ][Jobs] [SYSTEM] [JOB-1/Backup S-FILES02][VM-115/S-FILES02] Finished BackupDataCopy (FAILED, 490s).

Reason: Proxy transporter connection problem (ActionException).

Background

The error occurs when the source Transporter fails to maintain a stable connection to the target Transporter because of one of the following reasons:

  • Network issues between transporters.

  • Blocked ports (9446, 9448 - 10000) or ICMP traffic by the firewall/antivirus.

  • Transporter service stopped or is unresponsive.

Solution

To solve the issue, do the following:

  1. Check Network Connectivity. Ensure the source Transporter can reach the target Transporter over ports 9446, 9448–10000 and via ICMP (ping). See also Nakivo Deployment Requirements – Required Ports.

  2. Run the following commands from the source transporter:

ping <target_transporter_IP>

telnet <target_transporter_IP> 9446

telnet <target_transporter_IP> <port_9448-10000>

Note

Ports 9448–10000 are dynamically opened only during active data transfer on the Transporter.

  1. Check firewall and antivirus Rules. Verify that no firewall or antivirus solution is blocking communication between the transporters.

  2. Check Transporter Services. Confirm that the Transporter service is running on both source and target Transporters. Restart the service if needed.

  3. Re-run the Job. After verifying connectivity and services, restart the backup job.

  4. If the issue persists after following the steps above, create a Support Bundle and send it the NAKIVO Support.