Proxmox 8.1.4 fail to backup VM to PBS 3.1.4

[lolhunter]

I have a strange errors after update PVE to 8.1.
I have 2 PBS storages for backup and I can't backup VM on them. CT backups normaly, but VM stuck with strange error.

INFO: starting new backup job: vzdump 250 110 --all 0 --mailto  --mailnotification always --notes-template '{{guestname}}' --storage office --node px1 --mode snapshot
INFO: Starting Backup of VM 110 (qemu)
INFO: Backup started at 2024-03-02 19:11:06
INFO: status = running
INFO: VM Name: host.all4rc.ru-192.168.1.10
INFO: include disk 'scsi0' 'nvme:vm-110-disk-0' 100G
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating Proxmox Backup Server archive 'vm/110/2024-03-02T16:11:06Z'
INFO: enabling encryption
INFO: issuing guest-agent 'fs-freeze' command
INFO: issuing guest-agent 'fs-thaw' command
ERROR: VM 110 qmp command 'backup' failed - backup connect failed: command error: error trying to connect: error connecting to https://office.rcmart.ru:8007/ - dns error: Device or resource busy (os error 16)
INFO: aborting backup job
INFO: resuming VM again
ERROR: Backup of VM 110 failed - VM 110 qmp command 'backup' failed - backup connect failed: command error: error trying to connect: error connecting to https://office.rcmart.ru:8007/ - dns error: Device or resource busy (os error 16)
INFO: Failed at 2024-03-02 19:11:06
INFO: Starting Backup of VM 250 (lxc)
INFO: Backup started at 2024-03-02 19:11:06
INFO: status = running
INFO: CT Name: nextcloud.ownhost.ru
INFO: including mount point rootfs ('/') in backup
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: create storage snapshot 'vzdump'
  Logical volume "snap_vm-250-disk-0_vzdump" created.
INFO: creating Proxmox Backup Server archive 'ct/250/2024-03-02T16:11:06Z'
INFO: run: lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536 -- /usr/bin/proxmox-backup-client backup --crypt-mode=encrypt --keyfd=14 pct.conf:/var/tmp/vzdumptmp3427831_250/etc/vzdump/pct.conf root.pxar:/mnt/vzsnap0 --include-dev /mnt/vzsnap0/./ --skip-lost-and-found --exclude=/tmp/?* --exclude=/var/tmp/?* --exclude=/var/run/?*.pid --backup-type ct --backup-id 250 --backup-time 1709395866 --repository ---- --ns----
INFO: Starting backup: [px1.rcdrift.ru]:ct/250/2024-03-02T16:11:06Z
INFO: Client name: px1
INFO: Starting backup protocol: Sat Mar  2 19:11:15 2024
INFO: Using encryption key from file descriptor..
INFO: Encryption key fingerprint: 0e:a4:d0:e5:70:c6:0e:b3
INFO: Downloading previous manifest (Sat Mar  2 01:00:03 2024)
INFO: Upload config file '/var/tmp/vzdumptmp3427831_250/etc/vzdump/pct.conf' to '-----' as pct.conf.blob
INFO: Upload directory '/mnt/vzsnap0' to '------' as root.pxar.didx
INFO: root.pxar: had to backup 532.883 MiB of 82.454 GiB (compressed 104.503 MiB) in 233.62s
INFO: root.pxar: average backup speed: 2.281 MiB/s
INFO: root.pxar: backup was done incrementally, reused 81.933 GiB (99.4%)
INFO: Uploaded backup catalog (3.829 MiB)
INFO: Duration: 238.95s
INFO: End Time: Sat Mar  2 19:15:14 2024
INFO: adding notes to backup
INFO: cleanup temporary 'vzdump' snapshot
  Logical volume "snap_vm-250-disk-0_vzdump" successfully removed.
INFO: Finished Backup of VM 250 (00:04:16)
INFO: Backup finished at 2024-03-02 19:15:22
INFO: Backup job finished with errors
INFO: notified via target `------`
TASK ERROR: job errors

VM110 DNS Error and CT 250 backup normally at same job in same storage?
DNS error??
Both PBS storage work same - no backup for VM with DNS error...
Tried to put ip of PBS in hosts - same error.