Backup job trying to use Live Migration network

[cro-shi]

Windows 2019 Hyper-V cluster using iSCSI for CSVs. The iSCSI networks are 192.168.10.x/24 and 192.168.20.x/24; these are configured for no cluster communication. There is also an isolated network for Live Migration which is 192.168.30.x/24; configured for cluster-only communication. Then there is the server network which is 10.1.155.x/24, which is configured for cluster and client communication. The storage is a Lenovo DM5000 array, which runs ONTap (v9..

The Veeam server is configured as an off-host proxy, same Windows and Hyper-V version. It's been given access to the CSV volumes. MPIO is configured on all servers correctly. All servers have SnapDrive installed and configured and all SAN disks are showing. Off-host backups have been successful up until recently. All firewalls are off while we're troubleshooting.

Lately the backup jobs are failing with the error "RPC function called failed. Function name: [InvokerTestConnection]. Target machine: [192.168.30.x:6163]". The Veeam server cannot communicate on the 192.168.30.x network.

We have configured a Global Network Traffic rule and added 10.1.155.x/24 as a preferred network for B&R traffic, but the jobs are still trying to use 192.168.30.x.

Is there a way to prevent the backup jobs from using that isolated network?

[HannesK]

Hello,
first: I always recommend using on-host proxy to have a much more relaxed backup life. For off-host proxy to work reliable, the Windows / Hyper-V version, storage firmware version, hardware VSS provider version etc. has to be "stable" (which is complicated over time).

Having that said... if you say that it worked fine for a long time, then it sounds like a technical issue. For technical issues, please provide a support case ID for this issue, as requested when you click New Topic.

I recommend sending support also a picture with all networks in it.

Without case number, the topic will eventually be
deleted by moderators.

Best regards,
Hannes

PS: support can only help if you upload logs https://www.veeam.com/kb1832

[cro-shi]

I was hoping we could get a quicker answer here. Lately it seems support cases are limited to someone emailing links to a technote or setup documentation (which we've already seen). We opened a case: 04914085 and uploaded the logs.

We don't want to use on-host proxy because the front end network is 1GB and the storage network is 10GB.

[HannesK]

Hello,
fixing things on a forum that "worked before" if "nothing was changed" would be only guessing without logs.

Support can help you best, if they get the information needed for troubleshooting (network plan and logs as I mentioned earlier). The forums are mainly run by product management, not by support. So the support engineer doesn't read the information you post on the forums (for example that you already set preferred networks).

Best regards,
Hannes