Error: Unstable connection: unable to transmit data. Failed to upload disk

[abelat]

Hello there,

Case Id #04931594

I have a backup job which was going seamlessly. but in the last days it was failing after reaching 80% with error message attached below. I tried the job by disabling firewall rules nothing new occurred. All backup infrastructure components are working fine for other VMs. I have also checked firewall logs but there is nothing blocked related to this backup.


[EDIT by moderator]: removed log sniplet as stated in the forum guidelines

I need to figure out how to resolve this issue immediately.

[HannesK]

Hello,
and welcome to the forums.

I need to figure out how to resolve this issue immediately.

Then I recommend working with support. Support can analyze logs, they can give proper answers. It makes no sense to speculate on a forum (forums are mainly run by product management, not support).

Looks like something is blocking the connection.

Thanks for your understanding,
Hannes

[abelat]

Hello Hannes,

Thanks for the reply. Can you suggest If there is any way that points me to the place where the bottleneck is appearing. I tried to capture some packets using Wireshark and i noted a tcp-keep-alive failure. does it imply something???

[HannesK]

Hello,
in the logfiles (c:\programdata\veeam\backup) there are IP addresses / DNS names where the errors happen. TCP connections can be checked with any tool you like (telnet, powershell...)

Best regards,
Hannes