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RPC function call failed. The RPC server is unavailable. w/ Application-Aware Processing

KB ID: 1174
Product: Veeam Backup & Replication
Published: 2011-08-23
Last Modified: 2023-11-09
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Challenge

A Backup or Replication job utilizing Application-Aware Processing fails with the error:

RPC error:The RPC server is unavailable. Code: 1722

Cause

Possible causes include:

  • The ports that Veeam Backup & Replication is attempting to use are blocked by a firewall.
  • The VeeamVSSSupport service is stuck on the Guest OS
  • Antivirus or Antimalware software may attempt to interact with the VeeamVSSSupport service executable.

In rarer cases, dynamic port allocation needs to be configured.
 
Additional troubleshooting steps can be found in the following Microsoft KB article:
http://social.technet.microsoft.com/wiki/contents/articles/4494.windows-server-troubleshooting-the-rpc-server-is-unavailable.aspx

Solution

Firewall / Ports

A complete list of used ports can be found here: https://helpcenter.veeam.com/docs/backup/vsphere/used_ports.html#ms_servers

When Veeam Backup & Replication connects to a VM, it creates firewall exclusions for the ports and processes it uses. Veeam Backup & Replication, however, cannot add firewall exclusions to hardware or third-party software firewalls.

The Dynamic RPC ports assigned to the temporary guest agents are the most common ports that cause this issue when using Application-Aware Processing.

Dynamic RPC port range: 49152 - 65535

Note: The NIC’s Network Location being set to Public mode will also cause this, as Public mode sets the firewall to its strictest settings.

VeeamVSSSupport Service Cleanup

When no job is processing the VM, connect to it and check the following things:

  1. Make sure the VeeamVSSSupport service is no longer present.
    If it is, use the command ‘sc delete VeeamVSSSupport’ to remove the service.
  2. Make sure the c:\Windows\VeeamVSSSupport folder is not present.
    If it is, delete the folder. If it fails to delete, reboot, or resolve the file lock.

Antivirus/Antimalware

Please review the complete list of Antivirus/Antimalware exclusions here: http://www.veeam.com/kb1999.
 
The most common solution is to exclude the C:\Windows\VeeamVSSSupport\ folder from being scanned.

Dynamic Port Configuration

While it is uncommon, it is possible to reconfigure dynamic port allocation following the steps outlined in the following Microsoft KB article. These changes will need to be made on the server to which Veeam Backup & Replication is having trouble connecting.
 
http://support.microsoft.com/kb/154596

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